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Forum Discussion

cortig's avatar
cortig
Explorer | Level 4
3 months ago
Solved

Electron framework in the desktop app leading to MacOS Tahoe slowdowns

Application Affected
Dropbox
Device
Mac
Operating System/Browser (if using the web)
macOS 26
Dropbox App Version (if using the app)
234.3.5480

Question or Issue

Recent discussions have identified an issue with the electron framework leading to significant slowdowns in Mac OS 26 (Tahoe). 

You can see a good description of the problem here: https://mjtsai.com/blog/2025/09/30/electron-apps-causing-system-wide-lag-on-tahoe/

And this page offers scripts to identify apps that use the _cornerMask to draw drop shadows for windows in Electron apps (which triggers the slowdowns through WindowServer): https://gist.github.com/tkafka/e3eb63a5ec448e9be6701bfd1f1b1e58#file-detect-electron-apps-with-macos-lag-sh

I played around with he scripts and it looks like Dropbox 234.3.5480 is one of the affected Electron apps…

I'd be great to tweak the embedded framework (or use one of the newer, corrected frameworks) to eliminate the issue in Dropbox :-)

desktop
Mac
  • Neal's avatar
    Neal
    2 months ago

    Hi everyone! 

    Thank you for your patience, ir's much appreciated.

    I can confirm that a fix for this issue is now live in our most up to date stable build, 235.4.5905.

    Can you all try updating and then test your performance and letting me know how you get on?

15 Replies

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  • postnumbers's avatar
    postnumbers
    Helpful | Level 5
    2 months ago

    Hi Neal,

    Thanks for your reply. I’m monitoring the status of this topic as I’ve held off on installing macOS 26 until Dropbox’s issue related to Electron running under macOS 26 is resolved. I’ve used the tool I’ve provided a screenshot from to determine this. Maybe it’s based on an incorrect assumption.

    In view of this, I defer to others to provide feedback based on actual usage.

    I have no reason to expect that your team hasn’t resolved the issue, Neal. I’m just cautious, knowing the lost hours/days that rolling back the OS can take.

     Thanks again.

  • Neal's avatar
    Neal
    Icon for Community Manager rankCommunity Manager
    2 months ago

    That is absolutely more than fair postnumbers​!

    Better to be safe than sorry, I completely understand! Well hopefully in the meantime, some other users can weigh in on this to let us know their experience.

    Have you noticed any issues cortig​?

  • Neal's avatar
    Neal
    Icon for Community Manager rankCommunity Manager
    2 months ago

    Hi Sascha F.​,

    Just wanted to direct your attention to my reply to postnumbers​ in case this clears things up for you as well. Unless you're noticing any actual performance issues.

  • cortig's avatar
    cortig
    Explorer | Level 4
    2 months ago

    Everything seems fine for me with Dropbox 236.3.5800.

    I also use this script that searches for cornermask specifically inside the Electron frameworks and Dropbox now seems OK. 

  • Neal's avatar
    Neal
    Icon for Community Manager rankCommunity Manager
    2 months ago

    Thank you so much for confirming cortig​!

    And I'm glad to hear that there's no issues!

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