Redstone hoppers and devices causing major fps drop

Large redstone item sorter worked perfectly in 1.5.2 (getting 90FPS+). Now when running the same item sorter in 1.6.1 it causes massive FPS lag, dropping me down 20-30 FPS. It seems like there was major lag introduced with 1.6.1 when it comes to redstone devices. I tried to search for issues for this, but it is pretty difficult to search through the issues to find anything, so apologies if this is a duplicate

Attached is the schematic of the item sorter for drop in to the world. If you need anything else from me let me know.