Server Slow (Do I need more RAM or Processor)?

Currently I have an AMD64 3000+ and 2GB of RAM. When one of my sites reaches about 100-200 users, my server gets pretty slow (in terms of browsing). I.E. it would take 2 seconds to load an html or php page, instead of .5 seconds.

I have other sites on the server, so I'm guess actual usage on the server is anywhere between 200-300 users.

Would adding another 2GB of ram solve this problem, getting a better processor, or optimizing my apache and mysql better (I already optmized them plenty of times, not sure what else there is).

What would you guys recommand?

 

 

 

 

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