Mac beachballs or lagging performance? AI photo scanning may be the reason
Some Mac users on macOS 26.5 are seeing lag and beachballs, and background photo analysis by Apple Intelligence may be to blame.
Intelligence analysis by GPT-5.4 Mini
Reports from macOS 26.5 users point to background photo analysis as a likely cause of sluggish Macs, with `mediaanalysisd` consuming heavy CPU and battery in some cases. The suggested workaround is to leave the Mac plugged in overnight so the work can finish.
A Mac may feel slow because it is quietly sorting through photos in the background, like someone cleaning a huge messy room while still trying to answer the door. That hidden cleanup can make the computer act tired for a while.
Analysis
What users are seeing
9to5Mac says some Mac users on macOS 26.5 are reporting beachballs, lag, and higher battery drain. The writer says the problem showed up on his own machine too, where Activity Monitor showed mediaanalysisd using anywhere from 50% to 150% CPU.
The suspected cause
The article says searches turned up other users reporting the same thing, with some also seeing elevated CPU use from kernel_task and corespotlightd. The process mediaanalysisd is tied to analysis of a photo library, and the article says the consensus view is that macOS is carrying out AI analysis of photo content in the background.
The practical workaround
According to the article, the only clear fix users have found is to connect the Mac to power overnight and let the analysis complete. That suggests the slowdown may be temporary rather than permanent, but it still affects responsiveness while the work is running.
What is not established
The article does not prove that Apple Intelligence is the only cause, only that it appears to be the leading explanation among users and the writer's own observations. It also does not say whether Apple has acknowledged the issue or issued a fix.
Key points
- Some macOS 26.5 users are reporting beachballs, lag, and battery drain.
- `mediaanalysisd` is the process most associated with the slowdown in the article.
- The article says the process appears to be analyzing photo content with Apple Intelligence in the background.
- A suggested workaround is to plug the Mac in overnight and let the work finish.
- The article does not confirm a formal fix or an official Apple explanation.
If the background work is the real cause, the slowdown should be temporary and finish on its own. Leaving the Mac plugged in overnight may let the analysis complete and restore normal performance without any deeper repair.
If the process keeps running for too long or repeats often, users could keep seeing lag and extra battery drain. If the behavior is not limited to photo analysis, the symptoms could point to a broader macOS performance issue that still needs a fix.
