Essentially, mySQL was the bottleneck. He fixed that, then Apache became the bottleneck. He just didn't realize mySQL was his bottleneck (or that fixing that wo

Essentially, mySQL was the bottleneck. He fixed that, then Apache became the bottleneck. He just didn't realize mySQL was his bottleneck (or that fixing that would increase the load on the webserver) and therefore "blames" the functioning of the app on mySQL's slowness. Now, whether or not there are changes to Apache he could make to avoid having to queue ajax requests is not something I can speculate on.