What happens to the driver after impact? If you intend on increasing speed, your arms will allow the club to re-hinge. If you prevent this, you increase tension, which slows down your swing.
Step 1: Create Width. Step 2: Push away - transfering force away from the direction of the swing - not up. Step 3: Re-hinge the club; this requires relaxation, which increases speed.
Speed comes with control. Practice getting comfortable with the shots you are good at.
The motion of the golf swing is an unforgettable feeling. In the new year, learn to feel this motion.