// troubleshooting guide · apple keynote
Keynote Slow and Lagging With Large Presentations
- Status
- Workaround available
- platforms:
- macOS, iPadOS
- updated:
- November 15, 2026
- reports:
- 4
- Method
- how we research
RUNBOOK · keynote/slow4 FIXES
// quick answer
Keynote slows down and beachballs when decks are full of large photos and videos. Use File > Reduce File Size (on a backup), split very large decks, and check Activity Monitor for other heavy processes.
Most likely fix: Reduce the file size
How to fix it
// try these in order, the most common fix is first
FIX 1Reduce the file size
- 01Back up the presentation first
- 02Make sure no media is selected on the slide
- 03Choose File > Reduce File Size and pick the options, or apply them to a copy
Did this fix it?FIX 2Split the deck
- 01Duplicate the presentation
- 02Delete the second half in one file and the first half in the other
Did this fix it?FIX 3Copy slides into a new presentation
- 01Create a new presentation with the same theme
- 02Select all slides in the old deck and paste them into the new one
Did this fix it?FIX 4Check for background load
- 01Open Applications > Utilities > Activity Monitor
- 02Look for heavy CPU or memory processes and quit them while working
Did this fix it?
Symptoms
Spinning beachball while editing, long pauses every time the file saves, slow slide navigation and huge .key files.
Why it happens
- C-01High-resolution images and long videos embedded in the deck
- C-02Saving a multi-gigabyte file after every change
- C-03Background processes such as indexing or iCloud upload
- C-04Low RAM or disk space
// this guide also covers
- why is keynote so slow
- keynote lagging
- keynote beachball
- reduce keynote file size
- keynote slow to save
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Other Apple Keynote errors
- Keynote Not Opening or Crashing on Mac
- Keynote Export to PowerPoint Broken (Fonts & Animations)
- Keynote Video Not Playing in Presentation
- Keynote Presenter Display Not Working on External Monitor
- Keynote Remote Not Working on iPhone
- Keynote Not Syncing With iCloud Between Mac and iPad
- Keynote Collaboration Not Working
- Keynote Presentation Can't Be Opened (Too Old or Damaged)