Symptoms
- Browser feels sluggish loading pages
- Pages take longer to become fully responsive after loading
- Browser's own task manager shows extensions using notable memory/CPU
- Performance improves in a private/incognito window (where most extensions are disabled by default)
Likely causes
- CommonMultiple extensions running scripts on every page you visitEach one adds processing time to every single page load.
- CommonAn extension with a memory leak or inefficient codePoorly maintained extensions can consume growing amounts of memory over a session.
- CommonExtensions you forgot you installed and never useThese provide no benefit while still consuming resources.
- PossibleConflicting extensions performing similar functionsTwo ad blockers or two password managers running together can cause slowdowns.
- PossibleAn outdated or unmaintained extension no longer optimized for the current browser versionOld extensions may not benefit from newer performance improvements.
What to do
- Open your browser's extensions page (e.g., chrome://extensions or edge://extensions).
- Review the full list and disable or remove anything you don't actively use.
- Test browsing speed in a private/incognito window, which disables most extensions, to confirm they're the cause.
- Re-enable extensions one at a time if you want to identify which specific one is the heaviest.
- Keep the extensions you do use updated to their latest versions.
- Avoid installing multiple extensions that do the same job (e.g., two ad blockers).
- Restart the browser after making changes to fully apply them.
- Periodically review your extension list every few months, since new ones get added easily.
Tools and parts
- None required
When to call a pro
This is a simple software fix; professional help isn't needed.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.