对于一个活泼的Ubuntu + Rails服务器的建议

I run an Ubuntu 8.04 shared host (VMWare) with Apache + Passenger (= Mod Rails), MySQL and Acts_As_Ferret (in server mode). It's too slow at the first requests. I do a lot of REST operations on it and have very few users.I run an Ubuntu 8.04 shared host (VMWare) with