Probably a driver or software issue. Can't imagine the Wacom hardware is inherently laggy.
The drivers are written by Wacom, and the software isn't written by me AND the pen interfaces in major pieces of software were written for Wacom in mind (and often with input or actual code by Wacom)....
And as a user, I literally don't care why it's broken, only that it's broken and I have no need for a broken experience.
Laggy as hell to the point they're unusable to me.