Why does it take a long time to send ajax requests to openserver?

Question

PHP

There is a page on which ajax requests are sent in a chain. everything works fine on the remote server (average 150ms per request), but on the local server it takes 7-8s for one request. I work on openserver 5.2.2. What could be the reason for this slowdown?

Answer 1

the symptoms resemble the problem of sessions on files, requests are queued until the previous one is processed, the session file is blocked.

Answer 2

Do you have a debugger enabled? If yes, then it can slow down the whole process. It also happens that sending mail via smtp also works for a long time, but not so long.