Bad performance / CPU limit on act-4 maps

[wolfestridershooter]

Bug reported by wolfe_strider on Trello on November 5th

Description: This happens in a bunch of act 4 maps

Example: https://www.youtube.com/watch?v=T3jmYABFwAo Preview image:

[xoxor4d]

This is happening due to other, larger map areas getting tagged as potentially visibility and thus, being rendered and is not related to the emncipation grill. The second layer of emancipation grill popping in and out of existance is already fixed.

[xoxor4d]

95