I am running apache2 (2.2) on Ubuntu on a VPS with 768MB of RAM. For some reason it takes several seconds to load any page (even static html). The only component I can blame is Apache. However, I have no idea why it is acting that way. I even installed NewRelic to see if maybe it would help me diagnose the problem in a more visual and friendly format. I see that apache2 is using about 400MB of RAM, which seems like a lot, but the total is still well under 100%. I am still confused as to what the real problem is or how to properly diagnose it.
Memory usage according to top (as asked by answerer):
Mem: 768848k total, 753380k used, 15468k free, 39792k buffers Swap: 262140k total, 92696k used, 169444k free, 432888k cached
Results for "free -m":
total used free shared buffers cached Mem: 750 733 17 0 35 414 -/+ buffers/cache: 282 467 Swap: 255 90 165