Editor Input.PreUpdate absurd lag

So I'm working on a game (obviously), but I've noticed that over time the editor has been getting slower and slower. So slow that clicking a button takes over a second. Unity is basically unusable until I can find a fix. I have a decent computer and haven't had problems like this before, so I did a bit of profiling and found that the editor's Input.PreUpdate function is taking a really long time.

The reserved managed memory heap also seems a bit crazy, but because this is an editor issue I can't know for sure if this is an issue as well. A is when I first start the editor, B is after a few minutes of working.

I'm hoping someone with a bit more editor knowledge than me could be able to help explain what's going on here. Thanks!