Recently Upgraded to Windows 10, Severe Drop in Performance and Bizzare Bug.

Hi, I recently upgraded to windows 10, so I don't know if my recent problems are due to that, or the new patch. Either or both seem likely to me. Anyway, so I tried to play my first game of league after all of the updating I've done, and it was a very horrible experience. My framerate has dropped to what appears to be at most a third of what it used to be, not that my FPS is easily read in the HUD like it used to be (I mostly like the new HUD now that I've gotten used to it, some of the features are quite good.) My computer had no problems beforehand running the game on the settings I used, but even after lowering them from Medium to Low, there was no detectable increase in performance.

Furthermore, my computer played the sound of a dialog box opening, then my League screen went black. I could still hear everything that was happening, but was unable to see anything happening. I tried to exit the client by exing it out, but that didn't work, and neither did ALT+F4. I was able to ALT+TAB eventually, and exit it using task manager.

I will not be able to continue playing under these conditions unfortunately, as it makes it very difficult for me to play to a satisfactory level with the very poor framerates. Thank you for any information that you might have.