Drop frame rate when zooming out a lot on a complicated scene

Nobody has claimed this yet.

We have a relatively complicated scene set up and when we zoom out a lot. The ptcl commands count raised to about Two hundred thousand for some tiles and the frame rate dropped below 20FPS. For some reason, we want the path to be rendered, even if they are of subpixel scale.
Then we tried to solve this issue by filtering the last few draw objects' ptcl commands, and ignoring all proceeding once. We got the result right, but the performance didn't improve. The problem is. Some pixels in the tiles are not covered by any path, so they still need to go through all ptcl commands, find nothing to draw, and exit. Slowing down the whole process. Do you have any suggestions on how can we find these pixels faster?

Reproduce the reported behavior with a complicated scene while zooming out substantially, observing tile ptcl command counts and frame rate. Investigate how uncovered pixels still traverse all ptcl commands; done means preserving subpixel-scale path rendering while avoiding that unnecessary work and improving performance.

Written by the indexing model from the issue text.