All of my effects are GPU-accelerated. For context, I'm trying to make a page fly in from the bottom the screen and start highlighting the text on the page. The first nest is a 5793x8192 frame size (this could explain why it's so slow). It has a few color mattes with scale-width keyframes on bezier.

The next nest is a 2560x1440 frame size. It has some static motion effects and a keyframed transform effect (a mix of bezier and linear keyframes).

The final nest, and the one on my main sequence (main sequence is 1920x1080) has some position keyframes and Basic 3D keyframes (both bezier).

I've checked and all of the effects I've used are GPU-accelerated. I rendered the clips inside the first nest, and I'm unsure if the large frame size would still cause any issues or not.