How to Speed Up Safari on Mac

Apple builds Safari for the M-series chips it also designs. On paper, no browser should be faster on a Mac. In practice, Safari can absolutely crawl — pages load slowly, scrolling stutters, the address bar lags when you type. The reasons are usually fixable in a few minutes.

Here’s how to diagnose what’s slowing Safari down, in rough order of likelihood, with the fixes that actually work.

Step one: figure out if it’s Safari or something else

Open Activity Monitor. Sort by CPU. Look for “Safari” and any “Safari Web Content” processes (one per tab). If they’re sitting at 30% CPU each while you’re not even using Safari, you’ve got runaway tabs. If they’re idle but Safari still feels slow, the issue’s elsewhere.

Also check the Memory tab. If Safari Web Content processes are eating 8+ GB of RAM, that’s why Safari feels sluggish — your Mac’s swapping to disk to keep up.

Close runaway tabs

The single biggest cause of slow Safari: too many tabs. Especially tabs running ads, video, or auto-refreshing dashboards (Slack web, Trello boards, news sites). Each of those tabs is essentially its own process eating CPU and memory.

Quick fix: cmd-A in the tab bar selects nothing useful, so use Safari’s Tab Group feature instead. Window → Tab Groups → Save current tabs as group. Now you can close them all in one go and reopen later as a group.

Or just hover the tab list, pick the offenders (sites with sound icons, sites with active animations), close them. Often you’ll feel Safari snap back to fast within seconds.

Disable extensions you don’t actively use

Every Safari extension runs in every tab. An ad blocker, a password manager, a translation tool, a screenshot extension, a colour picker — five extensions across thirty tabs is 150 instances of extension code running.

Audit them: Safari → Settings → Extensions. Uncheck anything you haven’t deliberately used in the last month. You can re-enable them later if you miss them.

The biggest performance offenders are usually:

• Ad blockers with massive filter lists
• “Reader mode” extensions (Safari has Reader built in)
• Tools that monitor every page (price trackers, SEO tools)
• Anything that “improves” YouTube, Twitter, or Gmail

Clear the cache (the right way)

A bloated or corrupted Safari cache can make sites slow. Clear just the cache without losing your cookies and history:

1. Safari → Settings → Advanced
2. Tick “Show features for web developers”
3. Close Settings
4. Now there’s a Develop menu. Click it → Empty Caches (or cmd-option-E)

Cookies stay, sign-ins stay, but stale cached resources are gone. Reload the page, fresh fetch.

If you suspect specific sites are the problem: Safari → Settings → Privacy → Manage Website Data → search the site → Remove.

Clear caches across every browser at onceSweep clears Safari, Chrome, Firefox, and Arc caches in a single pass. Free download for Mac →

Check for a misbehaving website

Sometimes one specific site is the problem. Open the Activity Monitor inside Safari: Window → Activity (cmd-option-A). It shows CPU usage per page. The page hogging 80% CPU is the one causing your slowdown.

Common culprits:

• Pages with autoplay video ads
• Crypto mining scripts (yes, this is still a thing on shady sites)
• Old web apps with memory leaks
• Twitter/X feeds left open for hours
• Slack web with many channels active

Close that one tab and see if Safari recovers.

Reset Safari’s privacy report and cache files

Safari keeps a Privacy Report database that can grow over time. To check: Safari → Privacy Report. If you’ve been browsing for a year and never cleared it, this database can be 100+ MB.

You can reset it: Safari → Settings → Privacy → click “Manage Website Data” → Remove All. This also clears the privacy report contents.

Safari’s tracking-prevention machinery is one of the things that keeps it fast — but the database it relies on does need occasional housekeeping.

Update macOS

Safari ships with macOS, not as a separate download. To get the latest Safari, you need to be on the latest macOS version. System Settings → General → Software Update.

Each macOS release improves Safari’s WebKit engine. If you’re a major version behind, you’re missing performance improvements that ship for free.

Disable Safari Suggestions

Search Safari Suggestions hits Apple’s servers as you type. Usually fine, but on a slow connection or in regions where the request is slow, it adds visible latency to every search.

Safari → Settings → Search → uncheck “Include Safari Suggestions.” Address bar typing is now purely local.

Turn off iCloud Tabs syncing if you don’t use it

Safari syncs your tabs across devices via iCloud. Useful if you actually move between iPhone, iPad, and Mac. If you don’t, it’s just network chatter slowing things down.

System Settings → your Apple ID → iCloud → Saved to iCloud → Show All → toggle Safari off (just for iCloud sync — Safari itself stays on your Mac).

Reduce motion and transparency

Visual effects in Safari (and macOS in general) cost GPU cycles. On older Macs especially, turning them down helps:

• System Settings → Accessibility → Display → Reduce motion: on
• System Settings → Accessibility → Display → Reduce transparency: on

Tab switching, window switching, and full-screen transitions become snappier. Cosmetic only — no features lost.

Check Activity Monitor for “Safari Web Content (Extension)”

If you see processes named “Safari Web Content (Extension)” near the top of CPU usage, an extension is the culprit. Disable extensions one by one until the CPU calms down.

The most likely offenders: ad blockers (especially those with multiple filter lists), screen recording extensions, and accessibility extensions.

Don’t dig through Settings yourselfSweep surfaces every app’s permissions in one place. Free for macOS →

When Safari’s truly broken: reset it

If you’ve tried everything and Safari’s still slow, there’s a sledgehammer option:

1. Quit Safari
2. In Finder, press cmd-shift-G
3. Paste: ~/Library/Containers/com.apple.Safari
4. Move that folder to your Desktop (don’t trash it yet)
5. Reopen Safari

You’ll lose recent history and tabs, but it’s a clean state. If Safari’s now fast, you can move that folder to the Trash. If not, restore it from Desktop.

This is overkill for most cases. Try everything else first.

Memory pressure compounds Safari slowness

Safari shares your Mac’s RAM with everything else. If your Mac’s overall memory pressure is yellow or red (check Activity Monitor → Memory tab), Safari will feel slow regardless of what you do to it. The fix is to free RAM at the system level — quit other apps, close other browsers, restart heavy apps that have grown.

Caches across the system

It’s not just Safari that benefits from a clean. macOS itself accumulates cache files in ~/Library/Caches/ and /Library/Caches/ from every app you’ve ever run. On a Mac that’s been running a year, this can be 5-10 GB. While clearing it doesn’t directly speed up Safari, freeing storage and reducing background indexing helps everything feel faster.

A realistic before/after

Honestly, here’s what most people see after running through this list:

• Tab cleanup: noticeable improvement immediately
• Extension audit: one or two extensions usually identified as offenders
• Cache clear: helps for specific stuck sites, less for general slowness
• macOS update: sometimes a big win (especially major releases)
• Storage cleanup: helps system-wide responsiveness

The quick wins are: tabs, extensions, and storage. The rest is fine-tuning.

Sweep doesn’t make Safari faster directly — Apple’s already done that work. What it does is keep your Mac’s caches, log files, and forgotten downloads under control across every browser, so the storage and indexing pressure that compounds Safari slowness doesn’t pile up. Plus the ability to clear all browser caches in one pass is genuinely useful if you’re running more than just Safari.