the game is very smotth instantly after pressing "F3"

[Cengokill]

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Sometimes, I'm lagging A LOT when I use this mod inside a dungeon. For example (the most common example that happened many times), before to start the dungeon in front of the NPC, the dungeon timer start and when it's 0, I'm at 1 or 2 fps.

But when I click on "F3" key, the game is instantly very smooth.