after like 10 mins my game lags a ton

[Monsieur_Cheese]

it used to not lag and i would get smooth 1000-2000 fps but not after a bit of playing i get 1 frame every 5 seconds and then i become useless in dungeons,
unless i leave and rejoin but then skytils says that the server is lagging and spams chat messages and its completely unplayable, idk if its a mod or something, i allocated 2 gb ram to minecraft someone pls help

Spoiler: Mod list
ctjs-2.2.0-1.8.9
DulkirMod-1.2.8
Dungeon_Rooms-3.4.1
MC.1.8.9.Danker.s.Skyblock.Mod.-.2.2
NotEnoughUpdates-2.2.2...

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