GeForce RTX 2070 SUPER After Effect / There is no cuda option in AE

Set comp resolution to Auto, preview motion with magnification ratios of 50% or less, if necessary set preview options to skip 1 or 2 frames. Keep motion blur turned off for motion tests. When the motion is good, check a few of the most critical frames at a (hero frames) at full resolution and with all effects turned on then trust your work and send it to render and move on to the next comp. When you have all of the shots complete, do the final editing and sound in Premiere Pro. Don't edit in AE. More than 90% of my comps are one shot and under 7 seconds. Most of my projects are longer than 30 minutes.

This is how traditional animators worked for years. Pencil tests - rough sketches of the scene drawn with a pencil to check the look of the animation, then a few frames completed with full ink and paint and approved by the director, then the rest of the animation team does ink and paint to complete the project and get it sent to the animation camera. When each scene is done and the film is processed, the editor completes the project.  That's how all animation was done before we went digital and the workflow still works. Trying to get a real-time preview of a complex project that is longer than a few seconds in AE is pretty much a waste of time. You have to learn to trust your work. 

CUDA only works with Ray-traced rendering. Both have been deprecated for a couple of releases and now the Ray-traced rendering has been removed. CUDA acceleration only worked if the Render Cue was used for rendering and frankly, it caused more problems than it solved.