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I did not get lag when viewing the map from the death screen in the Watcher campaign. Can you send the logs (see the section BUG REPORTS)?

Context:
Chances are, that some costly function crashes and gets spammed / retried every frame. If that is the case then an exceptionLog.txt file should get generated.

I found a big bug I get a lag spike when I open the map in wacher in die or sleep sceen and in his region menu

You can try to verify the game cache and you can disable and enable region mods one by one to see if any of them in particular causes the issues.

oh and I use map warp mod but the new one and when I select modded room I see how is the room

how fix that?

Hm.. When you enable custom regions then the game processes them first. In this step, rooms and other things like the map are merged or replaced. You get files like map files like `map_cc-watcher.png` in the folder `Rain World\RainWorld_Data\StreamingAssets\mergedmods\world\cc\` for example.

This sounds like the map merging failed or the maps got replaced with empty files.

idk why I can't see the map in some moded regions or modded rooms in vanilla regions

thank you the map reveals like mollasses

This looks like a vanilla bug. You can try to disable the option `Item Tracker` and the vanilla option `Slug Senses` (in More Slugcat Expansion). If I am correct then either option will trigger the bug.

Context:
The function that crashes is the vanilla function ItemMarker.Draw(). ItemMarker are used for displaying key items on the map. My guess is that one key item is stuck in an invalid room (maybe it is in another region) and the Draw() function does not check if the room is null. It assumes it is valid.
If the theory is correct maybe you can give the devs your save file. Who knows what got stuck where. They should check the room in any case.
If the theory is false but the bug is prevalent then maybe you can send me your save file. Let me know how it goes.

https://pastebin.com/xS1GnxFT

Here is the logs.