Severe lag when scrubbing.

I am using APE15 on Wll. I am editing individual clips in the edit window but when I drag the cursor to scrub through the clip, the video is pausing and I then have to wait several seconds for it to catch up with me. Is there any way to scrub smoothly? I assume the graphics are overloading but I have 32GB RAM, Ryzen 9 CPU and GeForce RTX 3060 graphics. Any help would be appreciated.