We have a blog build with WP and for two years worked weel on a shared hosting, but traffic is increasing and some days ago we switched to a VPS (Linux-Debian) with 512Mb Ram. We have about 700 visitors/day and load time of the home is quite fast (45 queries in 1,5 seconds).
We noticed that the apache process eats all the available memory and that this can cause some problem, but we can't solve this. We tried to change apache configuration, following our sysadmin hints. We also removed all unnecessary plugins but this didn't solve the problem.
By now the solution we are using is a crontab entry with apache restart every 30 minutes, but we don't like this...
can you help me? thanks