25 Nov 2005
09 May 2012
Link to this post
For startes in July 5.1 should be released which should bring some speed enhancments due to changes in architecture (only load stuff when needed, kendo)
As for your question.
a) can you define very slow. Use Fiddler2.com to see what is going on
b) can you link us to the site so we can have a look at it and test the speed
c) can you give information about the hosting RAM, Shared, VPS and so on
d) Is the site only slow when accessed the first time or allways.
e) use Chorome for admins. Way faster then IE8 for example.
Sitefinity is know to be a bit slow when the application starts so I try to keep my sites warm. If you don't have enough visitors then it might be the case that the app is restarting and therefore takes 8-15 seconds for the first load. After that it should be fin.
I still belive in optimizing a site: minimize CSS, combine CSS, optimize JPG outside SF and so on. But I am a bit old fashioned.