The Current Performance Rank System is kinda flawed:

If you have an Avatar with 69,999 triangles and max out all other categories, you still will be rated as "Good".

If you now have an Avatar with 70,001 triangles, you get the very poor rating. Even if your other categories are in the "Excellent" region.

Which one of these avatars will now have a bigger impact on performance? Yes, the one with the "better" rating.

This is why the system needs a redesign and a better solution to determine how an avatar would perform.

Example: https://feedback.vrchat.com/feature-requests/p/rework-performance-ranks-into-a-point-system

By using a weighted or point system, we will get a far better and closer to reality result.