The most obvious slowdown that occurs is on the Chaos Wastes Holseher’s Tower (Something like that) Mission.
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Location: First room of the tower a few minutes into the map. It is full of tables and bookcases; and after you had crossed the bridge and a set of ladders or stairs up to it. It is always this room that destroys my performance the worst out of any location in this update.
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Specs: RTX 3070, Ryzen 7 3700x, 16 GB. High settings. FPS goes from 90 to 50 in that room when hordes and bosses spawn there. Very large difference. Repeatable. And improves afterwards on taking the next stairs. Before the update on other maps I often had FPS in the 110s steady throughout entire levels.
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Windows version: Version 10.0.19042 Build 19042
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I have played through the map on Sienna and otherwise, but I did not notice any significant difference.
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With or without powerups the FPS seems to be the same. But I’ve had the 20% HP power-up from a guaranteed boss spawn at least one time on the laggy map, and it did not spawn until we reached that room and then there were somehow two of them to deal with.