25 Nov 2005
07 May 2012
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5.1 should bring a great performance gain in this area. Until then I found that using a fast browser does make a huge difference. Chrome vs IE 8 is a huge difference.
Other then that, having enough RAM on my server I never felt that Sitefinity was very slow. Never felt it to be lighting fast either but at a good speed to be working at.
Also I felt that depending on the time of day the speed would differ indicating that the bulk of data beeing transmitted might be lagged by the internet connection (provider, atlantic your ISP) as well.
I would wait another 2 month and happely embrace 5.1.