I’ve been playing the Direwolf20 1.7.10 pack of Minecraft from the FTB Launcher, and I’ve been suffering from lag in it for some time. I had chalked it up to my computer and low FPS or to my slow internet connection to the server I play on. However, recently I noticed that it was actually centered around my mouse and keyboard. If I stand still and move my mouse enough for my character to do a 180, my mouse moves a consistent distance each time. In my case it’s about 1 inch. However, if I hold down a button on my keyboard and repeat the same thing with my mouse, I find my character turns wildly different amounts each time. Holding the key down for my push to talk in Teamspeak might mean I need to move my mouse 1 inch to do a 180, and 2 seconds later, I might need to move my mouse 4 inches to perform the same 180. It’s like someone is controlling my mouse sensitivity and randomly changing it from 20-100, but only as long as some key on my keyboard is held down. My friend playing the exact same mod pack, and the exact same server, does not experience this.