Weather effects cause keyboard lag

Whenever there are weather effects like rain or snow, my keystrokes are processed at a rate of maybe one per second. To make matters worse, if I lean on a key trying to get some response, the keystrokes queue up at a fast rate, so I may have to wait a couple minutes for that queue to clear (at the painfully slow rate) before I can press a key to respond to, for example, an NPC that's been beating on me for the last two minutes. Mouse actions are immediate and responsive, so if 100 W keystrokes are queued up, I sometimes have to run in circles to stay near the object I want to act on until the queue clears.

I've tried turning down graphics quality options without much success.

I've died many times due to this, and lost a powerboat and other goodies. I have basically decided the game is unplayable for me outdoors during any weather event.