I'm wondering why my installation of SS 2.2.1 is unbearably slow. The AJAX calls are tolerable, but noticably slower than other instances I've used. The worst, however, is changing tabs, say from Site Content to Files/Images. It brings up the SS logo screen as if I'm logging in again, and takes a good minute or so to get me to the next page.
I've tried the demo.silverstripe.com and it runs much faster. What should I be looking for in my configuration that might speed up SS? Is it not caching or something?