Symptoms
- Safari takes a long time to load pages
- Safari quits unexpectedly or shows a crash message
- Specific websites cause slowdowns or crashes more than others
- Safari feels fine at first but degrades the longer it's open
Likely causes
- CommonToo many open tabs consuming memoryEach tab holds its own resources, and dozens left open add up quickly.
- CommonA problematic Safari extensionExtensions run on every page and can cause instability if poorly coded.
- PossibleA corrupted or oversized browser cacheThis can cause slow loading and occasional instability.
- PossibleAn outdated version of Safari or macOSBrowser updates often include performance and stability fixes.
- PossibleA specific website with heavy scripts or ads overwhelming the browserSome sites are simply poorly optimized and stress any browser.
What to do
- Close tabs you're not actively using, keeping the total open count manageable.
- Check Safari > Settings > Extensions and disable any you don't actively need, especially ones from less familiar developers.
- Clear Safari's cache via Safari > Settings > Advanced > Show Develop menu, then Develop > Empty Caches.
- Update macOS, which also updates Safari, via System Settings > General > Software Update.
- Check Activity Monitor to see if a specific Safari-related process (like a particular tab) is using unusually high resources.
- Try browsing in a new Private window, which disables most extensions, to see if performance improves.
- Restart the Mac if Safari has been open for a very long time without a fresh restart.
- If a specific website consistently causes crashes, consider reporting it via Safari's built-in feedback or avoiding heavy tabs from that site.
Tools and parts
- None required
When to call a pro
This is a software issue you can resolve yourself; professional help isn't necessary.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.