I have recently just finished a map similar to the FTB Pyramid map, but in vanilla, It has a custom crafting system using armor stands, and lots of command blocks detecting blocks around entities, plus much more.
All of my command blocks are fine, and do not cause tps/block lag issues, except for a select few. I cannot for the life of me figure out why these specific ones are bringing my tps from 20 to 5 when all are activated. I will attach a download link to the world with this post, and outline the command blocks causing an issue with red concrete. There will also be a teleporter at spawn to get you there. I imagine it is something pretty obvious, I just need another set of eyes on the matter. Thanks in advance!