Excel super slow after updating to Tahoe 26.0.1

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.

The steps I took (thanks to Moto Lorne):

#1 Delete the Microsoft Excel App from your applications folder.

#2 Intall via https://officecdn.microsoft.com/pr/C1297A47-86C4-4C1F-97FA-950631F94777/MacAutoupdate/Microsoft_Excel_16.101.25100321_Updater.pkg

works a treat on MacBook Pro with M1 Pro chip running latest Tahoe, make sure you turn Microsoft AutoUpdater off until Microsoft stops trying to annoy Apple users..... and updates Excel for Mac with a proper fix. BTW, I tried latest Excel version 16.104 Beta but no difference

Confirming your observations:

— M4 Pro Macbook Pro 14" with 24GB RAM running Tahoe

it takes 5-6 seconds for Format Cells to open, whether invoked from the the menu bar or the command 1

Excel 365 16.102.1

— 2017 iMac 5K with 4.2ghz Core I7 and 16GB RAM running macOS 10.14 Mojave

It takes less than two seconds for Format Cells to open with either way of invoking..

Excel 2019, (v 16.054)

🙄

FYI, it’s Excel + Tahoe. Same version of Excel (16.102.1) on my other Mac still running Sequoia, the format dialog box opens immediately.

Basically,. yes. Wait for an Excel update. Ever-helpful Microsoft has a contact support option in the Help menu, but to access it (or even to access Help at all), you need to enable Connected Experiences so Microsoft can help themselves to your data for their AI models. That's a hard pass for me.

It is a disaster!

So, Excel for Mac (whatever version) and Tahoe (whatever version 26.01, 26.1) it doesn't matter, all of them just don't work well.

Excel is lagging, zooming in or out via trackpad results in a white screen until the zoom process ends. So you don't know how much you have zoomed in or out until the zoom process is finished.

Simple calculations take for ever to finish. You basically cannot work with Excel anymore. A simple task of a 15 seconds takes now several minutes to finish.

The Cell Format window used to take 5 seconds or more to load, but after Tahoe 26.1 it is resolved. Still all other issues remain!

All files I am using now, I used to work on before the update to Tahoe and the newest Excel version, and everything worked like a charm. Now I cannot even finish the simplest tasks on Excel!

It is a disaster!

Are you running the most recent version of Excel?

Takes about 7 seconds to open the format dialog box for me. Way too long. Report the issue to Microsoft.

For what it's worth, the issue seems to have been resolved.

Excel version 16.102.2 (25102623) and macOS Tahoe 26.1

I've tried all of the suggestions I could find online, but Excel is taking over 30 seconds to open the Format Cell option since I installed Tahoe 26.0.1

iMac 3.3 GHz 6-Core Intel Core i5, 64 GB memory

Just updated to Version 16.102.2 (25102623) dated October 28th. Still lagging. Guess we'll need to wait until Mac OS 26.1 comes out, hopefully later today or tomorrow. Then yet another MS Excel update beyond 16.102.2. Fingers crossed.

So I am able to type this sentence in the time it took an edit in a cell to update. Latest iPad, all up to date arghhhhh

Hello, anybody any solutions to this yet? What would the solution be, another Excel update any time soon? Can you migrate down a version of macos where it still works properly? Thanks All

This is a known issue. Microsoft is going to have to fix it, not Apple.