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Fix Mouse Lags and Major Freezes After Multithreaded Update page
If the issue causing the lag is your CPU over heating, then the cooling capabilities of your heat-sink is the problem. Not the fact that the Devs increased the priority of the process.
If you are seeing this issue, and the tools the OP provided show your computer is getting too hot, please, first thing to do is to thoroughly clean all of the fans and the inside of the computer. Give your computer a fighting chance to get rid of the heat first. If you are a bit more adventurous, try redoing the thermal paste in between the heat-sink and the CPU itself. There are plenty of guides on how to do this, I trust you can find them.