2

The lag is probably an indicator that Blender is trying to recalculate and redisplay one or more procedural modifiers while you're trying to weight paint. Try temporarily disabling any rigs (which would cause Blender to recalculate mesh deformations to match the rig pose), particle emitters (recalculating position of all the emitted children), modifiers etc....


2

Yes. (Besides being able to invert the influence of the vertex group in many of the modifiers, by hitting the small double-arrow icon next to the Vertex Group field....) If you want to invert the group itself, you can use the Vertex Weight Mix modifier targeted on the group (here, 'Group'), and mix with an anonymous Group B, with B's default weight set to ...


1

It sounds like you might have had an issue with migrating a file from 2.80 to 2.81, but hopefully this helps someone else doing weight painting in 2.81. In 2.81 with left click select, you should be able to select bones in Weight Paint mode with Ctrl-Left Mouse. You shouldn't need to switch to Pose mode to pose any bones. For completeness, my full set of ...


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