I don't have any recent streams showing it, and I can reproduce it without streaming. For me, it is literally as simple as running Make It Rain at the same time as Minecraft. The pack I'm running is Vault Hunters, which is a pretty heavy pack, but well within my system's capabilities.
So, I launch them both at the same time, and then in Minecraft, I get little frame hitches every few seconds. I can try to record a video of it later.
If it matters, here's my specs:
Windows 10
Ryzen 7 5800X
64 GB RAM
Geforce 3070 Ti
Dual 1440p monitors