DeviceTriage
Troubleshooting guide

Why is my browser running slow?

Identify whether extensions, tab load, storage, graphics acceleration, or the network is making browsing feel sluggish.

Run browser feature test

Common symptoms

  • Pages scroll or animate poorly
  • Tabs freeze or reload unexpectedly
  • Only web apps feel slow while desktop apps remain responsive

Possible causes

  • Heavy extensions or too many active tabs
  • Corrupted browser profile or site storage
  • Hardware acceleration disabled or software rendering active
  • Slow or unstable network responses

How to diagnose it

  1. Test the same page in a private window with extensions limited
  2. Run Browser Feature Test and GPU/WebGL Test
  3. Use Network Test to separate page rendering delay from connection delay
  4. Compare a fresh browser profile before resetting the main profile

Solutions to try

  1. Disable extensions one at a time
  2. Update the browser and restart it
  3. Clear data only for the affected site before clearing everything
  4. Enable hardware acceleration when supported
  5. Create a fresh profile if corruption is isolated to the current profile

The first 10-minute diagnosis

  1. Open the same page in a private window to reduce extension and existing-site-data effects.
  2. Compare one simple site and one heavy web app before calling the whole browser slow.
  3. Run Browser Feature, GPU, and Network tests to separate rendering, compatibility, and connection delay.
  4. Use the browser task manager to identify one tab or extension that remains busy.

Decision path by result

Private mode is fastInvestigate extensions, profile state, cookies, and site storage before reinstalling.
All browsers are slow on one siteThe site, account data, geographic route, or service load is more likely than one browser profile.
Scrolling and video stutter but downloads are fineInspect graphics acceleration, renderer status, display refresh behavior, and heavy page scripts.
Only first load is slowCompare DNS, connection setup, service worker/cache initialization, and security scanning before clearing all data.

Platform-specific checks

Chrome and Edge

Use the built-in browser task manager and graphics status page. Disable extensions in small groups and record which change reproduces the improvement.

Firefox

Troubleshoot Mode is a useful comparison because it temporarily reduces add-ons and customization without deleting the profile.

Safari and iOS

All iOS browsers use the system web engine. Compare content blockers, private mode, iOS storage, and the same site on another network.

What not to do first

  • Do not clear every password, cookie, and session before testing one site or a private window.
  • Do not disable security protections permanently because one page is heavy.
  • Do not install multiple optimization extensions; extensions themselves can add work to every page.

When to move beyond a browser test

  • Create a fresh browser profile if a controlled extension and site-data comparison points to profile corruption.
  • Move to operating-system diagnostics when other applications are also slow, unstable, or out of memory.

Last technical review: 2026-09-01

Frequently asked questions

Should I clear all browser data first?

Usually no. Start with the affected site or a private window so you do not erase useful sessions and preferences unnecessarily.

Can extensions slow every website?

Yes. Extensions that inspect or modify page content can add work to every tab, even when their toolbar interface is closed.