Oh no! I need to look into this some more, but it seems like maybe the sheet was getting overwhelmed by all the IMPORTRANGE calls. It seems to be working a bit better today, but I'll need to look into fixing it up to make those calls less burdensome and see if that makes a change. I'll need a bit of time to try out a fix and see if it helps any, but for now at least, it seems to be OK albeit a bit slow.