Since I started to create Immersive Engineering machines, the game started to lag. Every 30 second, it freezes completely, CPU fan at maximum speed, during 10-15 seconds. This makes it very hard to play, I have trouble getting around my map because it freezes all the times. Trying to relog fixed the issue for a couple of minutes, then it started again. Modded Minecraft is now super hard and frustrating not because of real challenges but because of this recurring lag. I had similar issues with Sky Factory 3, with no real solution, and now this starts again.
I cannot just skip Immersive Engineering, because I am in staged mode so I need to complete at least the required quests. Even basic machines like the coke and blast ovens, and the metal press, are causing this. I'm not into complex machines yet.