bug #34198 [HttpClient] Fix perf issue when doing thousands of reques…

…ts with curl (nicolas-grekas)

This PR was merged into the 4.3 branch.

Discussion
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[HttpClient] Fix perf issue when doing thousands of requests with curl

| Q             | A
| ------------- | ---
| Branch?       | 4.3
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

Performing while scheduling requests was a terrible idea: it makes buffers fill in memory and requires CPU do deal with the pending list, while all this in dealt with much more efficiently by any response-reading code that comes after.

Commits
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e388b73 [HttpClient] Fix perf issue when doing thousands of requests with curl

src/Symfony/Component/HttpClient/Response/CurlResponse.php

@@ -142,7 +142,6 @@ public function __construct(CurlClientState $multi, $ch, array $options = null,
         // Schedule the request in a non-blocking way
         $multi->openHandles[$id] = [$ch, $options];
         curl_multi_add_handle($multi->handle, $ch);
-        self::perform($multi);
     }
 
     /**