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High CPU usage when typing a message in Outlook

Anonymous
2024-11-06T10:00:58+00:00

OS: Win 11 Pro

Office: 2016 Pro

Hi everyone,

CPU activity goes to 16-22% when typing a message in Outlook 2016 and returns to 1 % when typing stops.

Deactivating (all) add-ins and Graphic acceleration did not solve the issue.

Deactivating spell check options did not cure the problem either.

The problem seems to be specific to Win 11 and does not occur on Win 10 OS.

If anyone has any suggestion on how to solve this issue...
PDMC

***moved from Outlook / Windows / Classic Outlook for Windows / For business***

Outlook | Windows | Classic Outlook for Windows | For business

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  1. Anonymous
    2025-03-18T11:23:11+00:00

    Thank you Gabriel!

    So what would you prefer as the best work-around until this bug will be fixed, doing the rollback to version 2405 or changing the channel to Semi-Annual?

    If I understand it right, version 2405 is missing later security fixes, whereas Semi-Annual Channel gets them?

    But doesn't Semi-Annual Channel get functional updates (even though later), so that sooner or later the bug will be back again?

    2 people found this answer helpful.
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  2. Anonymous
    2025-03-18T13:53:53+00:00

    Yes thank you Gabriel, I really hope they can find and fix this soon and roll this out to all the affected branches. But isn't SemiAnnual on 2408 now which is supposed to have the problem? And isn't LTSC 2024 also on 2408?

    4 people found this answer helpful.
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  3. Anonymous
    2025-04-08T20:01:47+00:00

    Any update on this?

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  4. Anonymous
    2025-04-08T20:39:28+00:00

    The issue has been escalated to the Outlook and Word Teams but no ETA yet. If you need to mitigate near term the best option is to switch to Semi Annual channel. The steps I posted on March 17th shows an option to fairly easily switch channels. I just tested Semi Annual again and I don't see any spike from that channel on the latest Version 2408 Build 17928.20468.

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  5. Anonymous
    2025-04-10T17:17:03+00:00

    Dear Gabriel,

    thank you so much for your extremely valuable actions and hints!

    I tried to change the workaround from the rollback to 2405 to the change of the update channel from current to semi-annual by the mentioned regedit, but unfortunately, the channel selector does not appear. I also found an alternative, similar but not exactly the same regedit how-to, but it also did not make the channel selector appear in office apps under file -> office account.

    Do you maybe know what could be wrong? Maybe the already made rollback overrides the possibility of channel slection?

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