Clicking the "S" key causes FPS to drop. Any Ideas to fix?

[Microsoft Windows]

Like most games, I use WASD to move around. However, I have noticed that clicking the "S" key causes extreme FPS drops. I have turned off sticky keys and filter keys, but the issue persists. I have also changed keyboards, and the problem is still there. Also, for example, if I am playing Minecraft if I decide to move backward by clicking S I will lose FPS but, if I click S + Shift or S + Ctrl I don't lose FPS. It's very strange since if I click S + D to move backward to the right I lose FPS. I can also repeatedly click S to lose high levels of FPS. Anyway, any fixes would be appreciated I woul

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