diff --git a/.gitignore b/.gitignore
index bdbcabaa3..360713b19 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 /coverage
 /node_modules
+/performance/lib
 /test/assets/QT3TS
 /test/assets/XQUTS
 /test/assets/runnablePerformanceTestNames.csv
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b2777ecc4..697abe2ce 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -153,7 +153,6 @@ FontoXPath contains different test sets:
 |The QT3 XQueryX tests|`npm run qt3testsxqueryx`|
 |The XQUTS tests|`npm run xqutstests`|
 |The XQUTS XQueryX tests|`npm run xqutstestsxqueryx`|
-|The QT3 performance tests|`npm run performance`|
 
 They all run in Node. By running the tests with the `--inspect` flag,
 they can be debugged by the browser: `npm run test -- --inspect
@@ -185,16 +184,24 @@ If you are adding a new feature, don't forget to edit the file
 `test/runnableTestSets.csv`. This file disables tests for features we
 have not yet implemented.
 
-To check the performance of fontoxpath we pick a random subset of the
-qt3tests as running all will take too long (hours). This random subset
-is not checked in but can be generated using
-`npm run performance -- --regenerate [<number-of-tests>]`, this will create
-and populate `test/runnablePerformanceTestNames.csv`. You can manually
-edit this file to run specific tests. By storing these in a file you can
-run the same set even when switching between different commits. With the
-generated file present you can run the tests using `npm run performance`,
-this will run a benchmark for each qt3 test using
-[benchmarkjs](https://benchmarkjs.com/).
+### Running benchmarks
+
+FontoXPath has 2 options to run benchmarks.
+
+In one we run benchmarks over scenarios defined in javascript which are located in the directory
+`/performance`. These can be run using `npm run performance` which will run the benchmarks in the
+console. Or you can start a server which hosts them using `npm run performance-server` which allows
+you to test the performance in different browsers. Some of these benchmarks are set up as a
+comparison which indicates the performance overhead of FontoXPath. Note that some tests use assets
+from the QT3TS, see the steps in [Setting up a development environment](#setting-up-a-development-environment).
+
+To check the performance of fontoxpath with the qt3tests, we pick a random subset of the qt3tests as
+running all will take too long (hours). This random subset is not checked in but can be generated
+using `npm run qt3performance -- --regenerate [<number-of-tests>]`, this will create and populate
+`test/runnablePerformanceTestNames.csv`. You can manually edit this file to run specific tests. By
+storing these in a file you can run the same set even when switching between different commits. With
+the generated file present you can run the tests using `npm run qt3performance`, this will run a
+benchmark for each qt3 test using [benchmarkjs](https://benchmarkjs.com/).
 
 ### Building
 
diff --git a/package-lock.json b/package-lock.json
index bccd39411..00d053532 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -312,6 +312,73 @@
 				"fastq": "^1.6.0"
 			}
 		},
+		"@rollup/plugin-commonjs": {
+			"version": "11.1.0",
+			"resolved": "https://registry.npmjs.org/@rollup/plugin-commonjs/-/plugin-commonjs-11.1.0.tgz",
+			"integrity": "sha512-Ycr12N3ZPN96Fw2STurD21jMqzKwL9QuFhms3SD7KKRK7oaXUsBU9Zt0jL/rOPHiPYisI21/rXGO3jr9BnLHUA==",
+			"dev": true,
+			"requires": {
+				"@rollup/pluginutils": "^3.0.8",
+				"commondir": "^1.0.1",
+				"estree-walker": "^1.0.1",
+				"glob": "^7.1.2",
+				"is-reference": "^1.1.2",
+				"magic-string": "^0.25.2",
+				"resolve": "^1.11.0"
+			},
+			"dependencies": {
+				"resolve": {
+					"version": "1.16.1",
+					"resolved": "https://registry.npmjs.org/resolve/-/resolve-1.16.1.tgz",
+					"integrity": "sha512-rmAglCSqWWMrrBv/XM6sW0NuRFiKViw/W4d9EbC4pt+49H8JwHy+mcGmALTEg504AUDcLTvb1T2q3E9AnmY+ig==",
+					"dev": true,
+					"requires": {
+						"path-parse": "^1.0.6"
+					}
+				}
+			}
+		},
+		"@rollup/plugin-node-resolve": {
+			"version": "7.1.3",
+			"resolved": "https://registry.npmjs.org/@rollup/plugin-node-resolve/-/plugin-node-resolve-7.1.3.tgz",
+			"integrity": "sha512-RxtSL3XmdTAE2byxekYLnx+98kEUOrPHF/KRVjLH+DEIHy6kjIw7YINQzn+NXiH/NTrQLAwYs0GWB+csWygA9Q==",
+			"dev": true,
+			"requires": {
+				"@rollup/pluginutils": "^3.0.8",
+				"@types/resolve": "0.0.8",
+				"builtin-modules": "^3.1.0",
+				"is-module": "^1.0.0",
+				"resolve": "^1.14.2"
+			},
+			"dependencies": {
+				"builtin-modules": {
+					"version": "3.1.0",
+					"resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-3.1.0.tgz",
+					"integrity": "sha512-k0KL0aWZuBt2lrxrcASWDfwOLMnodeQjodT/1SxEQAXsHANgo6ZC/VEaSEHCXt7aSTZ4/4H5LKa+tBXmW7Vtvw==",
+					"dev": true
+				},
+				"resolve": {
+					"version": "1.16.1",
+					"resolved": "https://registry.npmjs.org/resolve/-/resolve-1.16.1.tgz",
+					"integrity": "sha512-rmAglCSqWWMrrBv/XM6sW0NuRFiKViw/W4d9EbC4pt+49H8JwHy+mcGmALTEg504AUDcLTvb1T2q3E9AnmY+ig==",
+					"dev": true,
+					"requires": {
+						"path-parse": "^1.0.6"
+					}
+				}
+			}
+		},
+		"@rollup/pluginutils": {
+			"version": "3.0.9",
+			"resolved": "https://registry.npmjs.org/@rollup/pluginutils/-/pluginutils-3.0.9.tgz",
+			"integrity": "sha512-TLZavlfPAZYI7v33wQh4mTP6zojne14yok3DNSLcjoG/Hirxfkonn6icP5rrNWRn8nZsirJBFFpijVOJzkUHDg==",
+			"dev": true,
+			"requires": {
+				"@types/estree": "0.0.39",
+				"estree-walker": "^1.0.1",
+				"micromatch": "^4.0.2"
+			}
+		},
 		"@rushstack/node-core-library": {
 			"version": "3.19.5",
 			"resolved": "https://registry.npmjs.org/@rushstack/node-core-library/-/node-core-library-3.19.5.tgz",
@@ -733,6 +800,29 @@
 			"integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
 			"dev": true
 		},
+		"@types/estree": {
+			"version": "0.0.39",
+			"resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.39.tgz",
+			"integrity": "sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==",
+			"dev": true
+		},
+		"@types/events": {
+			"version": "3.0.0",
+			"resolved": "https://registry.npmjs.org/@types/events/-/events-3.0.0.tgz",
+			"integrity": "sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==",
+			"dev": true
+		},
+		"@types/glob": {
+			"version": "7.1.1",
+			"resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.1.tgz",
+			"integrity": "sha512-1Bh06cbWJUHMC97acuD6UMG29nMt0Aqz1vF3guLfG+kHHJhy3AyohZFFxYk2f7Q1SQIrNwvncxAE0N/9s70F2w==",
+			"dev": true,
+			"requires": {
+				"@types/events": "*",
+				"@types/minimatch": "*",
+				"@types/node": "*"
+			}
+		},
 		"@types/json5": {
 			"version": "0.0.29",
 			"resolved": "https://registry.npmjs.org/@types/json5/-/json5-0.0.29.tgz",
@@ -745,6 +835,12 @@
 			"integrity": "sha512-FwI9gX75FgVBJ7ywgnq/P7tw+/o1GUbtP0KzbtusLigAOgIgNISRK0ZPl4qertvXSIE8YbsVJueQ90cDt9YYyw==",
 			"dev": true
 		},
+		"@types/minimatch": {
+			"version": "3.0.3",
+			"resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
+			"integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==",
+			"dev": true
+		},
 		"@types/mocha": {
 			"version": "7.0.2",
 			"resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-7.0.2.tgz",
@@ -767,6 +863,15 @@
 				"@types/node": "*"
 			}
 		},
+		"@types/resolve": {
+			"version": "0.0.8",
+			"resolved": "https://registry.npmjs.org/@types/resolve/-/resolve-0.0.8.tgz",
+			"integrity": "sha512-auApPaJf3NPfe18hSoJkp8EbZzer2ISk7o8mCC3M9he/a04+gbMF97NkpD2S8riMGvm4BMRI59/SZQSaLTKpsQ==",
+			"dev": true,
+			"requires": {
+				"@types/node": "*"
+			}
+		},
 		"@types/sinon": {
 			"version": "7.5.2",
 			"resolved": "https://registry.npmjs.org/@types/sinon/-/sinon-7.5.2.tgz",
@@ -1468,6 +1573,12 @@
 			"integrity": "sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==",
 			"dev": true
 		},
+		"estree-walker": {
+			"version": "1.0.1",
+			"resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-1.0.1.tgz",
+			"integrity": "sha512-1fMXF3YP4pZZVozF8j/ZLfvnR8NSIljt56UhbZ5PeeDmmGHpgpdwQt7ITlGvYaQukCvuBRMLEiKiYC+oeIg4cg==",
+			"dev": true
+		},
 		"esutils": {
 			"version": "2.0.3",
 			"resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.3.tgz",
@@ -1688,9 +1799,9 @@
 			}
 		},
 		"glob": {
-			"version": "7.1.3",
-			"resolved": "https://registry.npmjs.org/glob/-/glob-7.1.3.tgz",
-			"integrity": "sha512-vcfuiIxogLV4DlGBHIUOwI0IbrJ8HWPc4MU7HzviGeNho/UJDfi6B5p3sHeWIQ0KGIU0Jpxi5ZHxemQfLkkAwQ==",
+			"version": "7.1.6",
+			"resolved": "https://registry.npmjs.org/glob/-/glob-7.1.6.tgz",
+			"integrity": "sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==",
 			"dev": true,
 			"requires": {
 				"fs.realpath": "^1.0.0",
@@ -1941,6 +2052,12 @@
 			"integrity": "sha512-2HvIEKRoqS62guEC+qBjpvRubdX910WCMuJTZ+I9yvqKU2/12eSL549HMwtabb4oupdj2sMP50k+XJfB/8JE6w==",
 			"dev": true
 		},
+		"is-module": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/is-module/-/is-module-1.0.0.tgz",
+			"integrity": "sha1-Mlj7afeMFNW4FdZkM2tM/7ZEFZE=",
+			"dev": true
+		},
 		"is-negated-glob": {
 			"version": "1.0.0",
 			"resolved": "https://registry.npmjs.org/is-negated-glob/-/is-negated-glob-1.0.0.tgz",
@@ -1953,6 +2070,15 @@
 			"integrity": "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng==",
 			"dev": true
 		},
+		"is-reference": {
+			"version": "1.1.4",
+			"resolved": "https://registry.npmjs.org/is-reference/-/is-reference-1.1.4.tgz",
+			"integrity": "sha512-uJA/CDPO3Tao3GTrxYn6AwkM4nUPJiGGYu5+cB8qbC7WGFlrKZbiRo7SFKxUAEpFUfiHofWCXBUNhvYJMh+6zw==",
+			"dev": true,
+			"requires": {
+				"@types/estree": "0.0.39"
+			}
+		},
 		"is-regex": {
 			"version": "1.0.5",
 			"resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.0.5.tgz",
@@ -2331,6 +2457,15 @@
 				"chalk": "^2.4.2"
 			}
 		},
+		"magic-string": {
+			"version": "0.25.7",
+			"resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.25.7.tgz",
+			"integrity": "sha512-4CrMT5DOHTDk4HYDlzmwu4FVCcIYI8gauveasrdCu2IKIFOJ3f0v/8MDGJCDL9oD2ppz/Av1b0Nj345H9M+XIA==",
+			"dev": true,
+			"requires": {
+				"sourcemap-codec": "^1.4.4"
+			}
+		},
 		"make-dir": {
 			"version": "3.0.0",
 			"resolved": "https://registry.npmjs.org/make-dir/-/make-dir-3.0.0.tgz",
@@ -2461,6 +2596,20 @@
 				"yargs-unparser": "1.6.0"
 			},
 			"dependencies": {
+				"glob": {
+					"version": "7.1.3",
+					"resolved": "https://registry.npmjs.org/glob/-/glob-7.1.3.tgz",
+					"integrity": "sha512-vcfuiIxogLV4DlGBHIUOwI0IbrJ8HWPc4MU7HzviGeNho/UJDfi6B5p3sHeWIQ0KGIU0Jpxi5ZHxemQfLkkAwQ==",
+					"dev": true,
+					"requires": {
+						"fs.realpath": "^1.0.0",
+						"inflight": "^1.0.4",
+						"inherits": "2",
+						"minimatch": "^3.0.4",
+						"once": "^1.3.0",
+						"path-is-absolute": "^1.0.0"
+					}
+				},
 				"supports-color": {
 					"version": "6.0.0",
 					"resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.0.0.tgz",
@@ -3455,6 +3604,15 @@
 				"glob": "^7.1.3"
 			}
 		},
+		"rollup": {
+			"version": "2.6.1",
+			"resolved": "https://registry.npmjs.org/rollup/-/rollup-2.6.1.tgz",
+			"integrity": "sha512-1RhFDRJeg027YjBO6+JxmVWkEZY0ASztHhoEUEWxOwkh4mjO58TFD6Uo7T7Y3FbmDpRTfKhM5NVxJyimCn0Elg==",
+			"dev": true,
+			"requires": {
+				"fsevents": "~2.1.2"
+			}
+		},
 		"run-parallel": {
 			"version": "1.1.9",
 			"resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.1.9.tgz",
@@ -3585,6 +3743,12 @@
 				"source-map": "^0.6.0"
 			}
 		},
+		"sourcemap-codec": {
+			"version": "1.4.8",
+			"resolved": "https://registry.npmjs.org/sourcemap-codec/-/sourcemap-codec-1.4.8.tgz",
+			"integrity": "sha512-9NykojV5Uih4lgo5So5dtw+f0JgJX30KCNI8gwhz2J9A15wD0Ml6tjHKwf6fTSa6fAdVBdZeNOs9eJ71qCk8vA==",
+			"dev": true
+		},
 		"spawn-command": {
 			"version": "0.0.2-1",
 			"resolved": "https://registry.npmjs.org/spawn-command/-/spawn-command-0.0.2-1.tgz",
diff --git a/package.json b/package.json
index bc0eda3ea..2a0a8bd19 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,9 @@
 		"coverage": "nyc report --reporter=text-lcov | coveralls",
 		"integrationtests": "ts-mocha --require test/testhook.js \"test/specs/parsing/**/*.ts\" -p test/tsconfig.json",
 		"prepare": "npm run build",
-		"performance": "ts-node -P test/tsconfig.json -r tsconfig-paths/register test/qt3testsBenchmark.ts",
+		"performance": "ts-node -P ./performance/tsconfig.json ./performance/runBenchmarks.ts",
+		"performance-server": "rimraf ./performance/lib && tsc -p ./performance/web.tsconfig.json && concurrently -k -p \"[{name}]\" -n \"tsc,rollup,server\" \"tsc -p ./performance/web.tsconfig.json -w\" \"rollup -c ./performance/rollup.config.js -w \" \"ts-node -P ./performance/tsconfig.json ./performance/server.ts\"",
+		"qt3performance": "ts-node -P test/tsconfig.json -r tsconfig-paths/register test/qt3testsBenchmark.ts",
 		"qt3tests": "ts-mocha --paths -p test/tsconfig.json test/qt3tests.ts",
 		"qt3testsxqueryx": "ts-mocha --paths -p test/tsconfig.json test/qt3testsXQueryX.ts",
 		"start": "concurrently -k -p \"[{name}]\" -n \"TypeScript,Node\" \"tsc -p ./demo/tsconfig.json -w\" \"ts-node ./demo/server.ts --dist\"",
@@ -61,9 +63,12 @@
 	"homepage": "https://github.com/FontoXML/fontoxpath",
 	"devDependencies": {
 		"@microsoft/api-extractor": "^7.7.10",
+		"@rollup/plugin-commonjs": "^11.1.0",
+		"@rollup/plugin-node-resolve": "^7.1.3",
 		"@tscc/tscc": "^0.4.8",
 		"@types/benchmark": "^1.0.31",
 		"@types/chai": "^4.2.11",
+		"@types/glob": "^7.1.1",
 		"@types/mocha": "^7.0.2",
 		"@types/node": "^13.5.0",
 		"@types/node-static": "^0.7.3",
@@ -74,11 +79,13 @@
 		"coveralls": "^3.0.11",
 		"cross-env": "^7.0.2",
 		"fs-extra": "^9.0.0",
+		"glob": "^7.1.6",
 		"mocha": "^7.1.1",
 		"node-static": "^0.7.11",
 		"nyc": "^15.0.0",
 		"pegjs": "^0.10.0",
 		"prettier": "^2.0.2",
+		"rollup": "^2.6.1",
 		"sinon": "^9.0.1",
 		"sinon-chai": "^3.5.0",
 		"slimdom": "^2.3.2",
diff --git a/performance/benchmarkRunner/BenchmarkCollection.ts b/performance/benchmarkRunner/BenchmarkCollection.ts
new file mode 100644
index 000000000..3b6118231
--- /dev/null
+++ b/performance/benchmarkRunner/BenchmarkCollection.ts
@@ -0,0 +1,55 @@
+import Benchmark from 'benchmark';
+
+type testFunction = () => void;
+type setupFunction = () => void | Promise<void>;
+type teardownFunction = () => void | Promise<void>;
+
+export default abstract class BenchmarkCollection {
+	protected readonly _benchmarks: {
+		benchmark: Benchmark;
+		setup?: setupFunction;
+		teardown?: teardownFunction;
+	}[] = [];
+
+	protected readonly _comparisons: {
+		benchmarks: Benchmark[];
+		name: string;
+		setup?: setupFunction;
+		teardown?: teardownFunction;
+	}[] = [];
+
+	public addBenchmark(
+		name: string,
+		test: testFunction,
+		setup?: setupFunction,
+		teardown?: teardownFunction
+	): void {
+		this._benchmarks.push({
+			benchmark: new Benchmark(name, test),
+			// We do not use the setup and teardown which is offered within the API of benchmarkjs
+			// as several attempts to get this working did not yield any successful results.
+			setup,
+			teardown,
+		});
+	}
+
+	public compareBenchmarks(
+		name: string,
+		setup?: setupFunction,
+		teardown?: teardownFunction,
+		...benchmarks: {
+			name: string;
+			test: testFunction;
+		}[]
+	): void {
+		// We do not use the setup and teardown which is offered within the API of benchmarkjs
+		// as several attempts to get this working did not yield any successful results. We also
+		// allow only 1 setup and teardown as all functions which compare with one another should
+		// use the same data to test with.
+		const comparison = { name, benchmarks: [], setup, teardown };
+		for (const benchmark of benchmarks) {
+			comparison.benchmarks.push(new Benchmark(benchmark.name, benchmark.test));
+		}
+		this._comparisons.push(comparison);
+	}
+}
diff --git a/performance/benchmarkRunner/BenchmarkRunner.ts b/performance/benchmarkRunner/BenchmarkRunner.ts
new file mode 100644
index 000000000..d3d378e0a
--- /dev/null
+++ b/performance/benchmarkRunner/BenchmarkRunner.ts
@@ -0,0 +1,87 @@
+import BenchmarkCollection from './BenchmarkCollection';
+import OnlyBenchmarks from './OnlyBenchmarks';
+
+class BenchmarkRunner extends BenchmarkCollection {
+	private readonly _only: OnlyBenchmarks = new OnlyBenchmarks();
+
+	public get only(): BenchmarkCollection {
+		return this._only;
+	}
+
+	public async run(): Promise<void> {
+		let benchmarks = this._benchmarks;
+		let comparisons = this._comparisons;
+		if (this._only.hasBenchmarks()) {
+			benchmarks = this._only.getBenchmarks();
+			comparisons = this._only.getComparisons();
+		}
+
+		console.log(`Running ${benchmarks.length} benchmarks`);
+		for (const benchmark of benchmarks) {
+			if (benchmark.setup !== undefined) {
+				benchmark.setup();
+			}
+
+			benchmark.benchmark.on('complete', (event: Event) => {
+				console.log(String(event.target));
+
+				const error = (event.target as any).error;
+				if (error) {
+					console.error(error);
+				}
+			});
+
+			benchmark.benchmark.run({ async: false });
+
+			if (benchmark.teardown !== undefined) {
+				benchmark.teardown();
+			}
+		}
+
+		console.log(`Running ${comparisons.length} comparisons`);
+		for (const comparison of comparisons) {
+			console.log(`------------${comparison.name}------------`);
+
+			const operationsPerSecond: { name: string; ops: number }[] = [];
+			for (const benchmark of comparison.benchmarks) {
+				if (comparison.setup !== undefined) {
+					await comparison.setup();
+				}
+
+				benchmark.on('complete', (event: Event) => {
+					console.log(String(event.target));
+
+					const error = (event.target as any).error;
+					if (error) {
+						console.error(error);
+					} else {
+						operationsPerSecond.push({
+							name: (benchmark as any).name,
+							ops: (event.target as any).hz as number,
+						});
+					}
+				});
+
+				benchmark.run({ async: false });
+
+				if (comparison.teardown !== undefined) {
+					await comparison.teardown();
+				}
+			}
+
+			operationsPerSecond.sort((a, b) => a.ops - b.ops);
+			const base = operationsPerSecond[0];
+			for (let i = 0; i < operationsPerSecond.length; i++) {
+				const ops = operationsPerSecond[i];
+				if (i === 0) {
+					console.log(`${ops.name} 100%`);
+				} else {
+					console.log(`${ops.name} ${(ops.ops / base.ops) * 100}%`);
+				}
+			}
+		}
+	}
+}
+
+const runner = new BenchmarkRunner();
+export default runner;
diff --git a/performance/benchmarkRunner/OnlyBenchmarks.ts b/performance/benchmarkRunner/OnlyBenchmarks.ts
new file mode 100644
index 000000000..250a671d0
--- /dev/null
+++ b/performance/benchmarkRunner/OnlyBenchmarks.ts
@@ -0,0 +1,25 @@
+import Benchmark from 'benchmark';
+import BenchmarkCollection from './BenchmarkCollection';
+
+export default class OnlyBenchmarks extends BenchmarkCollection {
+	public getBenchmarks(): {
+		benchmark: Benchmark;
+		setup?: () => void;
+		teardown?: () => void;
+	}[] {
+		return this._benchmarks;
+	}
+
+	public getComparisons(): {
+		benchmarks: Benchmark[];
+		name: string;
+		setup?: () => void;
+		teardown?: () => void;
+	}[] {
+		return this._comparisons;
+	}
+
+	public hasBenchmarks(): boolean {
+		return this._benchmarks.length !== 0 || this._comparisons.length !== 0;
+	}
+}
diff --git a/performance/compare.benchmark.ts b/performance/compare.benchmark.ts
new file mode 100644
index 000000000..8cc5d05df
--- /dev/null
+++ b/performance/compare.benchmark.ts
@@ -0,0 +1,151 @@
+import { Document, Node } from 'slimdom';
+import * as slimdomSaxParser from 'slimdom-sax-parser';
+import {
+	domFacade,
+	evaluateXPathToFirstNode,
+	evaluateXPathToNumber,
+	evaluateXPath,
+} from '../src/index';
+import runner from './benchmarkRunner/BenchmarkRunner';
+import jsonMlMapper from '../test/helpers/jsonMlMapper';
+import loadFile from './loadFile';
+
+const testDocumentFilename = 'test/assets/QT3TS/app/XMark/XMarkAuction.xml';
+
+let document: Document;
+
+runner.compareBenchmarks(
+	'simple traversal to first descendant',
+	() => {
+		document = new Document();
+		jsonMlMapper.parse(['r', ['a', ['b', ['c']]]], document);
+	},
+	undefined,
+	{
+		name: 'xpath',
+		test: () => {
+			evaluateXPathToFirstNode('descendant::c', document, domFacade);
+		},
+	},
+	{
+		name: 'manual',
+		test: () => {
+			let node: Node = document;
+			while (node) {
+				if (node.nodeName === 'c') {
+					break;
+				}
+				node = node.firstChild;
+			}
+		},
+	}
+);
+
+runner.compareBenchmarks(
+	'count 3190 text elements',
+	async () => {
+		const content = await loadFile(testDocumentFilename);
+		document = slimdomSaxParser.sync(content);
+	},
+	undefined,
+	{
+		name: 'xpath',
+		test: () => {
+			evaluateXPathToNumber('count(//text)', document, domFacade);
+		},
+	},
+	{
+		name: 'manual',
+		test: () => {
+			function countParagraphs(node: Node): number {
+				let count = 0;
+				if (node.nodeName === 'text') {
+					count++;
+				}
+				node.childNodes.forEach((child) => {
+					count += countParagraphs(child);
+				});
+				return count;
+			}
+
+			countParagraphs(document);
+		},
+	}
+);
+
+runner.compareBenchmarks(
+	'XMark-Q14, this is one of the more expensive tests in the qt3ts',
+	async () => {
+		const content = await loadFile(testDocumentFilename);
+		document = slimdomSaxParser.sync(content);
+	},
+	undefined,
+	{
+		name: 'xpath',
+		test: () => {
+			evaluateXPathToFirstNode(
+				`(: Purpose: Return the names of all items whose description contains the word ;'gold'. :)
+				<XMark-result-Q14> {
+					let $auction := (/) return
+					for $i in $auction/site//item
+					where contains(string(exactly-one($i/description)), "gold")
+					return $i/name/text() }
+				</XMark-result-Q14>`,
+				document,
+				domFacade,
+				{},
+				{ language: evaluateXPath.XQUERY_3_1_LANGUAGE }
+			);
+		},
+	},
+	{
+		name: 'manual',
+		test: () => {
+			function getDescendantItems(node: Node, nameTest: string): Node[] {
+				const results: Node[] = [];
+				node.childNodes.forEach((child) => {
+					if (child.nodeName === nameTest) {
+						results.push(child);
+					}
+					results.push(...getDescendantItems(child, nameTest));
+				});
+				return results;
+			}
+
+			const auction = document;
+			const nameContents = [];
+			auction.childNodes.forEach((child) => {
+				if (child.nodeName !== 'site') {
+					return;
+				}
+
+				const items = getDescendantItems(child, 'item');
+				for (const i of items) {
+					const descriptionElements = [];
+					i.childNodes.forEach((c) => {
+						if (c.nodeName === 'description') {
+							descriptionElements.push(c);
+						}
+					});
+
+					if (descriptionElements.length !== 1) {
+						throw new Error('FORG0005');
+					}
+
+					if (descriptionElements[0].textContent.includes('gold')) {
+						i.childNodes.forEach((c) => {
+							if (c.nodeName === 'name') {
+								nameContents.push(c.textContent);
+							}
+						});
+					}
+				}
+			});
+
+			const textNode = document.createTextNode(nameContents.join(''));
+
+			const res = document.createElement('XMark-result-Q14');
+			res.append(textNode);
+		},
+	}
+);
diff --git a/performance/evaluateXPath.benchmark.ts b/performance/evaluateXPath.benchmark.ts
new file mode 100644
index 000000000..d4c98b008
--- /dev/null
+++ b/performance/evaluateXPath.benchmark.ts
@@ -0,0 +1,17 @@
+import { Document } from 'slimdom';
+import { domFacade, evaluateXPath } from '../src/index';
+import runner from './benchmarkRunner/BenchmarkRunner';
+
+let document: Document;
+
+function setup() {
+	document = new Document();
+}
+
+runner.addBenchmark(
+	'evaluateXPath',
+	() => {
+		evaluateXPath('true()', document, domFacade);
+	},
+	setup
+);
diff --git a/performance/index.html b/performance/index.html
new file mode 100644
index 000000000..bd1eb8415
--- /dev/null
+++ b/performance/index.html
@@ -0,0 +1,16 @@
+<html>
+	<head>
+		<title>performance benchmarks</title>
+		<meta charset="utf-8" />
+		<script src="/lodash/lodash.js"></script>
+		<script src="/platform/platform.js"></script>
+		<script src="/benchmark/benchmark.js"></script>
+		<script src="/fontoxpath-perf.js"></script>
+	</head>
+	<body>
+		<div>
+			<h4>performance benchmarks</h4>
+			<pre id="output">Check the console for the results.</pre>
+		</div>
+	</body>
+</html>
diff --git a/performance/loadBenchmarks.ts b/performance/loadBenchmarks.ts
new file mode 100644
index 000000000..83707bca7
--- /dev/null
+++ b/performance/loadBenchmarks.ts
@@ -0,0 +1,23 @@
+import * as glob from 'glob';
+
+export function getImports(): string[] {
+	const toImport: string[] = [];
+	const files = glob.sync('performance/**/*.benchmark.ts');
+	toImport.push(
+		...files.map(file => {
+			const fileWithoutExtension = file.slice(0, -3);
+			// We need to replace 'performance/' with './'
+			const relativeImport = '.' + fileWithoutExtension.substring('performance'.length);
+			return relativeImport;
+		})
+	);
+
+	return toImport;
+}
+
+export default async function loadBenchmarks() {
+	const imports = getImports();
+	for (const relativeImport of imports) {
+		await import(relativeImport);
+	}
+}
diff --git a/performance/loadFile.ts b/performance/loadFile.ts
new file mode 100644
index 000000000..af0d10c4c
--- /dev/null
+++ b/performance/loadFile.ts
@@ -0,0 +1,12 @@
+declare var window: Window;
+
+export default async function loadFile(filename: string): Promise<string> {
+	if (typeof window !== 'undefined' && window.fetch) {
+		const request = new Request(`${window.location}${filename}`);
+		const response = await window.fetch(request);
+		return response.text();
+	} else {
+		const fs = await import('fs');
+		return fs.readFileSync(filename).toString();
+	}
+}
diff --git a/performance/rollup-plugin-import-benchmarks.js b/performance/rollup-plugin-import-benchmarks.js
new file mode 100644
index 000000000..9e5987119
--- /dev/null
+++ b/performance/rollup-plugin-import-benchmarks.js
@@ -0,0 +1,26 @@
+// We can import the javascript version as we always compile the typescript before rollup.
+import { getImports } from './lib/performance/loadBenchmarks';
+
+export default function importBenchmarks() {
+	return {
+		name: 'import-benchmarks',
+
+		load(id) {
+			if (!id.endsWith('runBenchmarks.js')) {
+				return null;
+			}
+
+			// We want to overwrite the code of runBenchmarks. Instead of loading all benchmarks by
+			// searching for the files we'll search for the files now and generate import statements.
+			const toImport = getImports();
+			let imports = '';
+			for (const i of toImport) {
+				imports += `import '${i}';`;
+			}
+
+			return `import runner from './benchmarkRunner/BenchmarkRunner';
+			${imports}
+			runner.run();`;
+		}
+	};
+}
diff --git a/performance/rollup.config.js b/performance/rollup.config.js
new file mode 100644
index 000000000..0a1a481c4
--- /dev/null
+++ b/performance/rollup.config.js
@@ -0,0 +1,25 @@
+import resolve from '@rollup/plugin-node-resolve';
+import commonjs from '@rollup/plugin-commonjs';
+import importBenchmarks from './rollup-plugin-import-benchmarks.js';
+
+export default {
+	input: 'performance/lib/performance/runBenchmarks.js',
+	output: [
+		{
+			name: 'fontoxpath',
+			file: 'performance/lib/fontoxpath-perf.js',
+			format: 'umd',
+			sourcemap: true
+		}
+	],
+	onwarn(warning) {
+		// Ignore "this is undefined" warning triggered by typescript's __extends helper
+		if (warning.code === 'THIS_IS_UNDEFINED') {
+			return;
+		}
+
+		console.error(warning.message);
+	},
+	plugins: [importBenchmarks(), resolve(), commonjs()],
+	external: ['benchmark']
+};
diff --git a/performance/runBenchmarks.ts b/performance/runBenchmarks.ts
new file mode 100644
index 000000000..e833c74ce
--- /dev/null
+++ b/performance/runBenchmarks.ts
@@ -0,0 +1,9 @@
+import runner from './benchmarkRunner/BenchmarkRunner';
+import loadBenchmarks from './loadBenchmarks';
+
+async function run() {
+	await loadBenchmarks();
+	await runner.run();
+}
+
+run();
diff --git a/performance/server.ts b/performance/server.ts
new file mode 100644
index 000000000..0adac13ff
--- /dev/null
+++ b/performance/server.ts
@@ -0,0 +1,41 @@
+import http, { IncomingMessage, ServerResponse } from 'http';
+import * as staticAlias from 'node-static';
+
+const builtFileServer = new staticAlias.Server('./performance/lib');
+const performanceFileServer = new staticAlias.Server('./performance');
+const rootFileServer = new staticAlias.Server('./');
+const modulesFileServer = new staticAlias.Server('./node_modules');
+
+http.createServer((request: IncomingMessage, response: ServerResponse) => {
+	request
+		.addListener('end', () => {
+			//
+			// Serve files!
+			//
+			if (request.url.startsWith('/test')) {
+				console.log('Serving .' + request.url);
+				rootFileServer.serve(request, response);
+				return;
+			}
+
+			switch (request.url) {
+				case '/fontoxpath-perf.js':
+				case '/fontoxpath-perf.js.map':
+					console.log('Serving ./performance/lib' + request.url);
+					builtFileServer.serve(request, response);
+					break;
+				case '/lodash/lodash.js':
+				case '/platform/platform.js':
+				case '/benchmark/benchmark.js':
+					console.log('Serving ./node_modules' + request.url);
+					modulesFileServer.serve(request, response);
+					break;
+				default:
+					console.log('Serving ./performance' + request.url);
+					performanceFileServer.serve(request, response);
+					break;
+			}
+		})
+		.resume();
+}).listen(8080);
+console.log('Now listening on localhost:8080');
diff --git a/performance/tsconfig.json b/performance/tsconfig.json
new file mode 100644
index 000000000..2f6946d18
--- /dev/null
+++ b/performance/tsconfig.json
@@ -0,0 +1,13 @@
+{
+	"extends": "../tsconfig.json",
+	"compilerOptions": {
+		"baseUrl": "..",
+		"esModuleInterop": true,
+		"lib": ["dom"],
+		"module": "commonjs",
+		"outDir": "lib",
+		"sourceMap": false,
+		"target": "esnext"
+	},
+	"include": ["../src/**/*", "**/*"]
+}
diff --git a/performance/tslint.json b/performance/tslint.json
new file mode 100644
index 000000000..16577d426
--- /dev/null
+++ b/performance/tslint.json
@@ -0,0 +1,7 @@
+{
+	"extends": ["../tslint.json"],
+	"rules": {
+		"no-console": false,
+		"no-implicit-dependencies": false
+	}
+}
diff --git a/performance/web.tsconfig.json b/performance/web.tsconfig.json
new file mode 100644
index 000000000..6399c52ba
--- /dev/null
+++ b/performance/web.tsconfig.json
@@ -0,0 +1,12 @@
+{
+	"extends": "./tsconfig.json",
+	"compilerOptions": {
+		"module": "esnext",
+		"outDir": "lib",
+		"paths": {
+			"slimdom": ["node_modules/slimdom/dist/slimdom.d.ts"],
+			"slimdom-sax-parser": ["node_modules/slimdom-sax-parser/index.js"]
+		},
+		"strict": false
+	}
+}