Safari tabs can use a large amount of memory when they contain video, web apps, live dashboards, online editors, or pages with poorly optimized scripts. When available memory runs low, your Mac may feel sluggish, apps may take longer to switch, and Safari can become unresponsive.
The fastest fixes are to close tabs you no longer need, quit Safari completely, remove unnecessary extensions, and identify demanding websites in Activity Monitor. If one website repeatedly consumes excessive memory, updating Safari and macOS, clearing that site’s data, or reporting the problem to the site’s developer may help.
Quick Answer
To reduce Safari’s memory use:
- Close unused tabs and Safari windows. 2. Quit Safari with Command-Q, then reopen it. 3. Use Activity Monitor to find Safari processes using the most memory. 4. Disable unnecessary Safari extensions. 5. Clear data for websites that repeatedly consume excessive memory. 6. Keep macOS and Safari updated. 7.
Why Safari Tabs Use So Much Memory
Every open webpage needs memory for its text, images, videos, scripts, cached content, and interactive features. A simple article may use relatively little memory, while a web-based spreadsheet, video site, social media feed, or browser game can use much more.
Safari may also keep separate processes for individual websites, extensions, and browser functions. This improves stability because a problem on one webpage does not always crash the entire browser, but it can make memory use harder to understand.
Memory use can increase when:
- A tab plays high-resolution video or audio.
- A webpage contains an online document or spreadsheet.
- A site continuously refreshes live information.
- A page has an inefficient or malfunctioning script.
- You keep many tabs open for days without restarting Safari.
- An extension adds features to every webpage.
- A webpage has been left open in the background while its content continues running.
High memory use is not automatically a problem. macOS uses available memory to keep apps and files responsive. The more useful warning signs are sustained slowness, frequent spinning beach balls, delayed typing, or high memory pressure in Activity Monitor.
Close Unused Tabs and Windows
The simplest way to reduce Safari’s memory use is to close pages you no longer need.
- In Safari, select the tab you want to close.
- Click the X on the tab, or press Command-W.
- Repeat for other unnecessary tabs.
- Close unused Safari windows as well.
If you want to keep a page for later, add it to your bookmarks or Reading List before closing it. You can also copy important text or save a file before removing the tab.
To close multiple tabs, Control-click a tab and choose an available closing option, such as closing tabs to the right. Review the menu carefully before selecting an option, particularly if several tabs contain unsaved work.
Close All Other Tabs
If one tab is important and the rest are not:
- Control-click the tab you want to keep.
- Choose Close Other Tabs, if that option appears.
This can quickly reduce Safari’s workload, but it closes the other tabs immediately. Save anything important first.
Quit and Reopen Safari
Closing individual tabs may not immediately release every resource associated with a webpage. Quitting Safari gives its processes an opportunity to stop and release memory.
- Save any work in web pages.
- Choose Safari > Quit Safari, or press Command-Q.
- Wait a few seconds.
- Open Safari again from the Dock, Applications folder, or Spotlight.
If Safari does not quit normally, press Option-Command-Escape, select Safari, and click Force Quit.
Warning: Force Quit closes Safari without giving webpages time to save unsaved information. Use it only when Safari is frozen or will not quit normally.
If Safari reopens the same tabs and windows, it may restore the pages that were open previously. Close unnecessary restored tabs, then quit Safari again if needed. You can adjust Safari’s startup behavior in Safari > Settings > General, but the exact options available may vary by macOS version.
Find Memory-Hungry Safari Processes
Activity Monitor can show which Safari processes are using the most memory. This is useful when one tab or website appears to be causing the problem.
- Open Activity Monitor. You can find it in Applications > Utilities or search for it with Spotlight.
- Click the Memory tab.
- Click the Memory column heading to sort processes by memory use.
- Look for Safari-related processes near the top of the list.
- Select a process only if you recognize that it belongs to a problematic Safari tab or extension.
Safari may display several processes with similar names. A process may represent a webpage, an extension, or a browser service, and its name may not clearly identify the tab. Use the memory information as a clue rather than ending random processes.
The Memory Pressure graph at the bottom of Activity Monitor provides a broader view:
- Green generally indicates that memory is being managed comfortably.
- Yellow indicates that memory resources are becoming more limited.
- Red indicates that macOS is under significant memory pressure.
Memory pressure can be affected by every app running on your Mac, not just Safari. Quit other apps you are not using, especially video editors, virtual machines, games, and large creative applications.
End a Problematic Process Carefully
If you have identified a Safari process that is clearly connected to a frozen or malfunctioning page:
- Select the process in Activity Monitor.
- Click the Stop button, which looks like an octagon with an “X.”
- Choose Quit first.
- If the process does not stop, return to the dialog and choose Force Quit.
Warning: Ending a Safari process can close a webpage and discard unsaved work. Do not force-quit processes simply because their memory number looks high. Safari may temporarily use more memory while loading a page and release it later.
Disable Unnecessary Safari Extensions
Extensions can add password tools, content filters, shopping features, translation tools, and other functions to Safari. Poorly designed, outdated, or unnecessary extensions can increase memory use.
- Open Safari.
- Choose Safari > Settings.
- Click Extensions.
- Select an extension you do not need.
- Clear its checkbox to disable it, or click Uninstall if you want to remove it.
Disable extensions one at a time and use Safari normally afterward. This makes it easier to identify an extension that causes excessive memory use.
Warning: Disabling an extension may remove features from webpages, while uninstalling it may remove its Safari settings or stored data. Make sure you know how to reinstall or configure it again before deleting it.
Pay particular attention to extensions that interact with every page, inspect scripts, block content, or modify video and social media sites. Keep extensions that you trust and regularly use, but avoid installing several tools that perform similar functions.
Clear Data for a Problematic Website
A website may behave poorly because its stored cookies, cache, or local website data has become corrupted or unusually large. Clearing data for that site can force it to create a fresh local profile.
- Open Safari.
- Choose Safari > Settings.
- Click Privacy.
- Click Manage Website Data.
- Search for the affected website.
- Select the site and click Remove.
- Click Done.
- Quit and reopen Safari, then test the website again.
Warning: Removing website data may sign you out of the site and delete local preferences, shopping-cart contents, offline data, or other saved information. Make sure you know your login details and save any important online work first.
If the problem affects many websites, you can remove more website data, but targeted removal is safer and less disruptive than deleting everything.
Update macOS and Safari
Safari is delivered as part of macOS, so Safari updates generally arrive through macOS updates. Updates can fix browser bugs, improve compatibility with websites, and address problems involving extensions or web content.
- Open the Apple menu.
- Choose System Settings.
- Click General.
- Click Software Update.
- Install available updates, if any.
- Restart your Mac if macOS requests it.
Warning: Save your work before installing updates. Your Mac may restart, and open apps may close.
If no update is available, your Mac is already offering the newest update available for its current software configuration. You can also check the Safari version by choosing Safari > About Safari.
Reduce the Number of Active Web Apps
Some websites continue working even when their tabs are in the background. Examples include messaging services, email, online meetings, music players, collaboration tools, and live dashboards.
When possible:
- Close web apps you are not actively using.
- Sign out of services that do not need to remain open.
- Avoid keeping multiple copies of the same web app open.
- Use a desktop app instead of a browser tab if the service provides one and it performs better for your workflow.
- Pause video, music, or live streams before leaving a tab in the background.
Pinning a tab can make it easier to find, but it does not make the page use less memory. Treat pinned tabs as active browser pages rather than lightweight bookmarks.
Restart Your Mac
If Safari and other apps remain slow after you close tabs and quit Safari, restart the Mac.
- Save your work in all open apps.
- Open the Apple menu.
- Choose Restart.
- Confirm if macOS asks you to do so.
- Open only the Safari tabs you need after the restart.
A restart clears temporary system state and stops processes that may not have ended cleanly. It is not a substitute for identifying a consistently faulty website or extension, but it can resolve a short-term memory problem.
Troubleshooting Safari Memory Problems
Safari becomes slow after opening one particular website
Close that tab and reopen it in a new window. If the problem returns, remove that website’s data through Safari > Settings > Privacy > Manage Website Data. Test the site with Safari extensions disabled. If the issue continues, the website itself may have a script or feature that Safari handles inefficiently.
Memory use keeps growing while a tab remains open
This may indicate a memory leak. A memory leak occurs when a webpage or extension continues holding memory that it no longer needs.
Quit and reopen Safari, then test the page again. If the same site causes the problem repeatedly, keep the tab closed except when needed and contact the site’s support team. Include the page address, what you were doing, and whether disabling extensions changed the behavior.
Safari shows high memory use, but the Mac works normally
Do not use the memory number alone to decide that Safari is malfunctioning. macOS may use available memory for caching and can reclaim it when another app needs it. Check Memory Pressure in Activity Monitor and pay attention to actual symptoms such as slow performance, frequent beach balls, or application crashes.
The Mac is slow even after Safari is closed
Safari may not be the only cause. Check Activity Monitor’s Memory tab for other apps using substantial memory. Quit apps you do not need, restart the Mac, and check whether the problem returns before reopening Safari.
If slow performance occurs regularly with only a few tabs open, the cause may be an extension, another app, insufficient available memory for your workload, or a website-specific bug.
Safari is frozen and will not quit
First, wait briefly to see whether the page finishes loading. If Safari remains unresponsive, press Option-Command-Escape, select Safari, and click Force Quit.
Warning: Force Quit may discard unsaved forms, messages, edits, or documents in web apps. Reopen Safari afterward and check whether the site restored your work.
Frequently Asked Questions
Does closing a Safari tab free memory immediately?
Usually, closing a tab reduces the resources Safari needs, but memory may not drop instantly.
How many Safari tabs are too many?
There is no universal limit. The practical limit depends on your Mac’s available memory and what each tab is doing. A few demanding web apps can use more memory than many simple text pages. Use Activity Monitor and Memory Pressure to judge the effect on your Mac.
Will clearing Safari history reduce memory use?
Clearing history is not usually the main solution to high memory use. Website data, active webpage scripts, extensions, and open tabs matter more. Clear data for a specific problematic website when appropriate, rather than deleting all history unnecessarily.
Should I use a memory-cleaning app?
Usually, no. macOS already manages memory and virtual memory automatically.
Can private browsing prevent Safari tabs from using too much memory?
Private browsing changes how Safari stores browsing data; it does not guarantee lower memory use. A demanding website can still use substantial memory in a private window.
Does restarting Safari delete my bookmarks or passwords?
Normally, quitting and reopening Safari does not delete bookmarks or saved passwords. However, closing a webpage can discard unsaved information entered into that site. Save your work before quitting or force-quitting Safari.
Final Thoughts
The most effective way to control Safari memory use is to identify the demanding tab or extension rather than closing everything repeatedly.