I usually get around 60 fps pretty consistently. Now, after thresh came out, my fps would drop to 30 occasionally. Ping is pretty consistent.

You're not the only one. Last night in one game the FPS suddenly dropped to 30-33 and stayed there for about 3-5 seconds. It happened twice and both times there was no battle going on.

Might be a memory leak.

I'm having the same problem after the patch Thresh'm getting 1-15 FPS, once stood with 50-60

Try having 20 minute constant dcing.. It's great. Iv'e already been banned for (afking) When I cant move at all..

same prob guys!

EVERY game since last patch starts fine, then after 5 mins or so the fps drops steadily usually hovering around 12-15 - which is pretty unplayable. I think I've been reported for it by some pretty unforgiving teammates..... Tried lowering the graphics settings, had absolutely no effect... I even upgraded my ISP (tripled my speed AND lowered my bill, a good deal) My PC is fairly old but never had issues like this before last patch..

Are all of you running the most recent graphics drivers release?

Yes

I have updated my nvidia drivers, comepletely uninstalled then reinstalled LoL, I ahve uninstalled pando media booster as well as Akamai netsessions, (i have read that they both are very abusive and eat bandwidth) but nothing has changed. I tried a custom game with all bots and the exact same thing happened. it ran fine for like 7 or 8 minutes, then the fps dropped to 20...then 15...8...etc...the ping spiked a few times at like 200-300 but even when the ping stayed low, the FPS never recovered. It would bounce around between 1 fps and 15 fps, SOMETIMES getting as high as 20-25. The game is unplayable. I have checked my wifi and it is fine, I did a speed test and it was fine. I ONLY have issues when playing LoL and ONLY since last patch.

same with me 10 fps for maybe 5-10 minutes then goes back to norm then back to 10 fps