session_start() takes VERY LONG TIME

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session_start (with sessions stored in files) is blocking in PHP, so this issue will appear if you try to start several server sessions for the same browser session (AJAX or multiple browser tabs/windows). Each session_start will wait until the other sessions have been closed.

See here: http://konrness.com/php5/how-to-prevent-blocking-php-requests/

Try changing from files to database storage of sessions.

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