Looks like this issue has been fixedby the devs!
I had a lot of trouble with a really heavy feeling, laggy mouse.
The main things to do to address that are:
Those are the rough steps, but you can find better info in the first post of this thread on the Steam forums: Big ol' PAYDAY2 mouse lag thread
A site that uses the PAYDAY2 Steam API to display a bunch of stats attached to whichever account is entered (as long as it's public), including:
There are two address for the site, both are cannon, both have the same amount of characters:
A site for experimenting with player builds. You can set level and amount of money too.