CMS Increase speed and optimize CMS?
 

Hello, I use vBulletin Suite 4.0.3 and I noted that the CMS is not very speed and is few optimized, of default I see with "Page Speed" and Yslow":

CMS - Page Speed Score - About 66 or 69/100

CMS - Yslow - Grade D

According you, what are the best tips, modifications or Hacks to increase the CMS?

Thank you