Remove cold slowdown entirely

[Mouse]

What Dickles said. It also is a very good buff for lings. What I propose is two simple ways to make it more bearable. Help intent on self should warm you up, imagine you're rubbing your hands together or something, and secondly, make cold slowdown scale with just how cold you are. So while you're in a vented room, you'll be as slow as you are now, but when you leave it, you'll quickly be moving a bit faster, especially if you warm yourself up.

Pretty sure it already works that way, it just takes forever to warm up once you leave the cold.  You cool off obscenely fast, but warming up takes forever.