diff --git a/.github/workflows/actions/go-test-setup.yml b/.github/workflows/actions/go-test-setup.yml
new file mode 100644
index 0000000..fad3c9e
--- /dev/null
+++ b/.github/workflows/actions/go-test-setup.yml
@@ -0,0 +1,7 @@
+runs:
+  using: "composite"
+  steps:
+    - name: increase the UDP receive buffer size # see https://github.com/lucas-clemente/quic-go/wiki/UDP-Receive-Buffer-Size
+      shell: bash
+      run: sysctl -w net.core.rmem_max=2500000
+      if: ${{ matrix.os == 'ubuntu' }}
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4064357..001726f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -51,10 +51,13 @@ jobs:
           postgresql db: 'postgres'
           postgresql user: 'postgres'
           postgresql password: 'postgres'
-
       - name: Setup gotestsum
         run: go install gotest.tools/gotestsum@latest
 
+      - name: Run repo-specific setup
+        uses: ./.github/actions/go-test-setup
+        if: hashFiles('./.github/actions/go-test-setup') != ''
+
       - name: Test
         env:
           W3S_TOKEN_TEST: ${{ secrets.W3S_TOKEN_TEST }}