So far, with the recent update, nothing has been fixed with the "bug" problems. I get a little better fps overall after the last download (i assume the requirements were lowered more for the "lowest" settings), but the following mechanics turn my fps to 10, and 1 if two of them are used at the same time in close proximity to each other:
LeBlanc's Teleport move (forget the name)
Akali's shadow circle thingy (although this one isn't as bad)
Let's just say anyone's ult that takes more than 1 second to execute/channel. That makes the list shorter.
Um... there were others, but I'm sure Riot already knows about most of them. If you want me to go back and look at all the others I noticed, I can. Just let me know.