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hisagishi Taint itself doesn't cause much lag AFAIK; the mobs it creates can cause entity lag though.
Again, though, OpenBlocks Tanks(as seen in image 5, 6, 13, 14, 15, and 16) lagged me like crazy when I had them stacked. This was a few versions of Open Blocks ago, mind you, so maybe whatever issue they caused is fixed.
Looks like you're using them for lighting via lava in many places, and for liquid metal storage in image 14. If you must have fluid lighting, maybe try TE3 and it's Portable Tanks? Fill them up with a bright fluid and you have light. For EXP storage(like in image 13) I'd suggest using one BC tank, then pipe it all off to a XU Drum(or a few of them if you have a LOT of EXP to spare).[DOUBLEPOST=1396958535][/DOUBLEPOST]
It's because each one ticks as its own tile entity, instead of as a multiblock. They are horrible on servers.
Ah, that explains a bit. Kudos Wagon153 for explaining this to me and OP.