session_start seems to be very slow (but only sometimes)

Question

For some odd reason, just today our server decided to be very slow during the starting of sessions. For every session_start, the server either times out after 30 seconds, or

Answer 1

I know this is an old question but I've just fixed this issue on my server. All I did was turn on the bypass cache for the domains in the cache manager in the cpanel.

My sessions were taking ages to start and close now they are instant.