Here's a drill from Lucas Wald with to help with the driver:
While this drill is simple, it actually serves quite a few different purposes.
A big part of the purpose of this drill is that it should help get a feel for eliminating actually thinking swing mechanics in the golf swing. Some swing mechanics thoughts can be very complicated like something you may see out of M.O.R.A.D. And some swing mechanics thoughts can be very simple like 'keep the head down' or 'keep the left arm straight.' Whatever swing mechanics thoughts you're using, the use of swing thoughts are often counterproductive in terms of performance.
I used to think that you had to have conscious swing thoughts to play golf. But after the past 2 years of utilizing slow motion practice and learning how to sense the swing instead of thinking about the swing while swinging, my mind has changed. And sometimes it's not so much a swing though as it is thinking about timing your swing.
Another great part of this drill is that it starts to pick up the tempo of the swing. If you want to gain distance off the tee, you really have to swing hard to do so. Again, I used to be about 'effortless power', but over the past few years I have come to believe that even the most effortless swings like Sam Snead likely felt like they were putting an immense amount of effort to do so. But between flexibility, their body dimensions and hand-eye coordination, they can make it look easy.