Edit mode is very slow when a subdiv is applied

Even on very simple meshes, there’s a lot of lag moving in and out of edit mode, and tons of lag in edit mode when subdiv is applied. Even at very sane settings and polycounts it’s almost impossibly slow relative to 2.79

Otherwise, great update!

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Known issue.

Ah ok - thank you . Do you know if this is something that is being worked on?

This seems to be a tough business, but yeah sure, they are investigating solutions to this.
See: https://developer.blender.org/T57936