unrendered AE comps in PPro will not typically play smoothly.
to help you in the animating you are doing in Premiere Pro…
with both Applications open
You can try ram caching a comp in AE first.
then switch to PPro.
As they share the same ram cache you should be able to play things a bit more smoothly in PPro.
Once you get things set up you will then render that section in PPro.
watch ram usage and save frequently.
Alex