I use the latest crackpack instance, the mekanism version is 6.0.4.42 there.

i made a teleport linked to another, and entered. after i was teleported i got 0 fps (the teleportation was inside my base chunkloaded to chunkloaded area around 50 blocks top)

i punched the portal out, and after a while my fps is ok, but if i go close to the (not existing) portals, i get 0 fps again for 3-4 sec.

any solution for this?

Should be fixed for the latest v7 build.