Based on code by Ansariel with fixes by Rye.

Tweak zoom behavior

Optimize two vectors in alpha draw pool by making them static and clearing at end of draw, this avoids thousands of mallocs

Reduce numerous and costly map finds in mesh fetch pipeline as well as one extremely expensive map key usage that was pointless

This reverts commit 74288100.

This reverts commit dd782497.

This reverts commit f6ba7b06.

This reverts commit eb819116.

This reverts commit 4d88f18c.