Dropping Frames

After a recent patch (can't tell exactly which) my game started dropping frames in big teamfights. Before it was a 60 constant even on my old graphics card (Radeon HD7770) and now it drops to 25-50. All graphical settings are maxed, eye candy is on as well as character inking, resolution 1920x1080. Specs: -AMD Athlon x4 750k (OC-4.0GHz) CPU -Sapphire Radeon Rx-480 8GB GPU -8GB system ram 1372MHz -500w PSU If you need any additional info just ask.
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