Extreme FPS Drop after Installing New Client

So after installing the new client my frames have dropped from 120+ fps to 30 fps, which is simply unplayable. I did a clean reboot to no avail. How do I return to regular frames, if not, how can I return to using the original client instead of this one? Something to note is that I had uninstalled league the night before, and then reinstalled it and opted to download the new client. Additionally, due to being afk in this game, which I had to do to fix this fps issue, I have been penalized with 5 20 minute waits before finding games. Because it was out of my control, this particular game should not be counted against me and the ban should be lifted, shouldn't it? Please help.
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