If you put down a iron golem spawner, it instantaneously starts to lower FPS by almost half and spams the client log

Log:
latest.log

and a video show how much it impacts the FPS (pay attention to Rivatuner): https://streamable.com/vdr799

i decided to open an issue here because it mentioned "not enough crashes" in the logs

Wrong issue tracker

This is not a Not Enough Crashes bug, that line is just because the mod is changing how Minecraft handles exceptions. Could you put the NBT data in a pastebin (if the NBT is small, just send it directly) and comment it? I think this is a vanilla bug or a fabric bug.

i think i might have did "/give iron_golem_spawner"(replace with username btw) and then placed it down then i get an FPS drop

That is not an item, only spawner blocks exist. If you want to put an entity in it you will have to use nbt.

idk for u but apparently it showing iron_golem_spawner right for me, Maybe a plugin?

also i found it to be doing the same thing with bee spawners also