I havent noticed any loading issues, although my Safari has been crashing a bit lately. Its only when I have 4-5 windows open at a time and when a few of them may be trying to load or refresh at the same time, so I guess its really my fault...but I am a multi-tasker, so I just cant do only one thing at a time lol
I didn't recognize problem in loading sites like facebook or other flashanimated sites with Safari.
But I have problems uploading pictures on many sites like puseforum for example. I can't upload one pic as an attachment whatever size it is. At the same time I have no problems uploading the same pic on picasa. It shouldn't make a difference if I upload it on one or the other page