In game I don't have any problems with lag but when I load up the pvp.net interface changing runes and selecting games becomes tedious as it is very laggy. Why don't they just use the same graphics engine as in game and create a nice interface for us to use??

Very*

Yeah the pvp .net interface is pretty damn laggy, it's too loaded with all these fancy animations that just lag and take up time.

Personally I'd rather not have any animations than these slow and laggy ones.

i know!!!!!

It's too cpu heavy for those of us with ****ty cpu's.

my gfx card is decent so im okay in game but in pvp.net my god.

also i wouldn't mind if they just let us change our runes and masteries through the LoL website.

It is much easier to do animations in Flash than in C. This is maybe the reason why they chose Flash for developing the Pvp.Net GUI.

Lagging animations can indeed happen in different computers, eventhough I haven't encountered these issues yet. I'm guessing lag is more evident in animations involving gradients, since most of the time they require more intensive rendering.