Upon completing any multiblock it causes far more tps and fps lag than it should.

Forge: 14.23.5.2811
Mekanism: 1.12.2-9.6.3.355(and many older versions had the same issue)

FPS is likely to do with the particles, as for tps lag, profiling evidence would be appreciated

I've experienced this as well, maybe we could add a config to disable particle effect just to see if it is the cause. I doubt it is the only reason but would need to look at the code.