So it'd be surprising to me if a developer chose to use uncompressed/lightly compressed assets, and compressing them caused performance to increase; because you're intentionally choosing the tradeoff in the opposite direction the developer did
Of course, there are game developers that are less technical and may not have knowingly made that tradeoff in which case all bets are off, but the games made by those developers tend not to be the kind that require beefy machines to run at 60fps+