Huge frame rate difference between release / debug versions

Question

I am working on a DirectX game, and I found that during releases I get an average of 170 frames per second, however in debug builds I get ~ 20 frames per second.

I was wondering if this is a massive difference between release and debug versions, especially since I have no trace in debugging? I know that there must be a performance gap between debug and release builds, is it just not necessary?

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