I have a VPS with about 10 to 15 Drupal sites running on it. None are extremely high traffic but each has at least a few visitors a day. I can't be sure its a pattern but I believe some of my sites are starting to run slowly specifically when logged in a administrator performing tasks like installing modules and changing themes. I am wondering if this has to do with CPU throttling...
I am wondering if I should:
a) Increase the RAM on my VPS. I read somewhere that the amount of CPU that you are allocated depends on the amount of RAM you use. Is that true? I currently am on 400Mb RAM but my graph shows that I never really go higher than 200Mb.
b) Move from VPS to PS. I imagine I would get a big performance boost moving to a dedicated server. Is that the case?