GitLab

There are the following issues pertaining to JSONFeed and Http parsers which per my profiling tests seems to be first candidates for fixing:

• JSONFeed::postBuffer expensive because of making new allocations all the time
• JSONFeed::popNextFromBuffer makes many buffer de-allocations
• JSONFeed::innerJSONHandler should not transition if the state remains the same
• HttpResponseParser body handler is inefficient as it reads characters one by one
• Connection::doTransaction should not reinitialize the parser all the time as it triggers expensive reinitialization of the state machine