Good afternoon, during profiling my app through blackfire I found, my website loading is stucked for approx second-two in session_start(). I founded some results on internet. For example - install php memcache extension and set "memcached.sess_locking=off". I did it and now session_start() stucks shorter time, but still enought (approx 200 - 600 ms).

Can you help me where can be the next problem, or where to look on? Thank yo ufor your help

PHP 7.4, Debian 9.13