Shift, Ctrl & Backspace Lowers Framerate Substantially

Whenever I press shift to crouch or to capitalize a letter in chat, or if I press ctrl to sprint, or backspace to delete text, my framerate drops from 60fps to 5fps. I have never had any issues like this before the release of MC 1.12, and being a YouTuber it is making it impossible to record my videos with such low framerate.