How do I fix performance issues in SSF4:AE on the PC?

How do I fix performance issues in SSF4:AE on the PC? -

So I have had the game for a while now, having a positive experience with it, my PC achieved an average of 60 FPS while playing it, but now, it just reaches an average of 13 FPS, making it unplayable, I don't have any idea for the reasons of this and I am desperate for a fix since I can't find anything on the internet, does anybody have an idea for this?

I have a Radeon HD 6670 Graphics Card and a AMD FX 8120 @ 3.1 Ghz proccessor.






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How do I fix performance issues in SSF4:AE on the PC? -
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