I've started seeing a situation on our internal Atlassian Confluence instance where we get snappy performance most of the time, but a couple of times an hour requests (both read and write operations) just hang for up to a few minutes (longest I've seen is 5 minutes).
I could plough through http://confluence.atlassian.com/display/CONF34/Performance+Tuning but just wanted to check if anyone could point me to anything obvious.
Our setup uses Confluence standalone fronted by an Apache 2.2 instance on the same host, which uses mod_proxy to forward requests to Confluence. Apache is set up to use HTTPS for all requests. We have a MySQL DB on a separate server.
There's no obvious spikes in CPU or memory usage on the Confluence or DB servers, so I don't think garbage collection is the problem, and I've tried increasing the MaxThreads in Apache to no avail.
Thanks in advance ...