We recently installed ELOG and it works pretty well, but the load times are rather inconsistent. Most of the time 
it is very fast, but it also often hangs for around 5-10 seconds while loading. It seems to affect all parts of 
the page that are returned at random, so sometimes the main html file will hang, sometimes the css file and 
sometimes the images.

The hardware it is running on is nothing special, an older 3 GHz Celeron, but it should be fast enough. It is 
running on Debian 7. 

Any ideas what the problem could be, or how I could investigate it further to find the bottleneck?