Excel is super slow after the update to Tahoe 26.0.1. It takes more than 5 seconds to open the Format Cell option in a blank file. This lag is very frustrating.
I have a Macbook Air, Chip Apple M3, Memory 16 GB, HD 512 GB, bought one year ago.
MacBook Air 13″, macOS 26.0
I would wait until Tahoe 26.1 is released and you have updated to it. Then repeat this Excel test and see if the response times have improved to format cells. If it has, then it was some issue with Apple frameworks in 26.0.1, and if it persists then contact Microsoft.
I am using a Mac Mini M4 Pro (14c/20g) with 64 GB RAM and Tahoe 26.0.1. Launched Excel 16.102.2 and opened a blank worksheet. Whether I pressed ⌘1 or right-clicked on a blank cell and chose Format Cells…, it took about 5 - 7 seconds to open the panel. Only one browser tab open in Safari and no other user applications active.
For me, as well.
Then you should troubleshoot YOUR problem, because the issues reported in this thread have already been resolved by updates.
It got better after the update, however, it continues to lag 1 or 2 seconds. I'll wait for next Tahoe update.
Excel super slow after updating to Tahoe 26.0.1
