Apple Releases Safari Technology Preview 121 With Bug Fixes and Performance Improvements

Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced in March 2016. Apple designed the ‌Safari Technology Preview‌ to test features that may be introduced into future release versions of Safari.

Safari Technology Preview Feature
‌Safari Technology Preview‌ release 121 includes bug fixes and performance improvements for Web Inspector, CSS, GPU Process, Media, Web API, JavaScript, WebAssembly, Accessibility, and Speech Recognition.

The current ‌Safari Technology Preview‌ release is the built on the new Safari 14 update included in macOS Big Sur with support for Safari Web Extensions imported from other browsers, tab previews, password breach notifications, web authentication with Touch ID, and more.

The new ‌Safari Technology Preview‌ update is available for both macOS Catalina and macOS Big Sur, the newest version of the Mac operating system.

The ‌Safari Technology Preview‌ update is available through the Software Update mechanism in System Preferences to anyone who has downloaded the browser. Full release notes for the update are available on the Safari Technology Preview website.

Apple's aim with ‌Safari Technology Preview‌ is to gather feedback from developers and users on its browser development process. ‌Safari Technology Preview‌ can run side-by-side with the existing Safari browser and while designed for developers, it does not require a developer account to download.

Top Rated Comments

aesc80 Avatar
16 months ago
Posting in here so Safari Beta feels appreciated.
Score: 5 Votes (Like | Disagree)
Kobayagi Avatar
16 months ago
I've been using Safari for more than 10 years, but the latest version is horrible honestly.
It has become very, very slow while I haven't changed anything about my setup or the way I use Safari. I also haven't added any new extensions. Same Mac, same everything. It also runs like crap even without any extensions, clear cookies, cache etc.

Web pages just keep freezing and make me wait for more than 10 sec for them to respond, double taps to zoom with the Magic Mouse make it freak out and lag so much. It makes my MacBook Pro freak out and the temps go high and so does the fanspeed...

I still use Safari because it's convenient with all the iCloud sharing between my iPhone and iPad. I hate to say it, but Chrome runs so, so much better, regardless what Apple's fancy speed bragging comparisons say. But I also don't wanna switch with everything to Google for obvious reasons.
Score: 4 Votes (Like | Disagree)
Rob_2811 Avatar
16 months ago

Hello, Facebook! ;)

Joke aside, what makes you say so? What kind of requirements do you have for Safari to have disappointed you? Genuinely curious.
I just experience a lot of slow loading pages and hangs. Almost every time I can drop the URL in to Firefox and the page loads instantly.

I mostly used Firefox anyway for the superior dev tools but would occasionally use Safari when on the go for the better battery life, I gave up on Safari completely about six months ago.
Score: 3 Votes (Like | Disagree)
steve333 Avatar
16 months ago

I've been using Safari for more than 10 years, but the latest version is horrible honestly.
It has become very, very slow while I haven't changed anything about my setup or the way I use Safari. I also haven't added any new extensions. Same Mac, same everything. It also runs like crap even without any extensions, clear cookies, cache etc.

Web pages just keep freezing and make me wait for more than 10 sec for them to respond, double taps to zoom with the Magic Mouse make it freak out and lag so much. It makes my MacBook Pro freak out and the temps go high and so does the fanspeed...

I still use Safari because it's convenient with all the iCloud sharing between my iPhone and iPad. I hate to say it, but Chrome runs so, so much better, regardless what Apple's fancy speed bragging comparisons say. But I also don't wanna switch with everything to Google for obvious reasons.
I have the same issues as do many others, I have read forums here and on reddit about the problem. Do you also get a spinning beach ball when clicking on the bookmarks menu?

Interesting, you need to look elsewhere for what is going on, it’s not safari which works great
Yeah, it is Safari. See above. Worked great before Big Sur, works like garbage afterwards.
Apple isn't even acknowledging the issue. I opened a thread on Apple's support forums and they give the usual do this do that that fixes nothing, then they just left
Score: 2 Votes (Like | Disagree)
steve333 Avatar
16 months ago

If it was safari, I would have the problem too. So no, you are wrong, it is not safari. On the other hand, after the big chrome security issue recently, my safari would not load without crashing. I did a clean install, deleted chrome altogether and I am running completely fine. So not safari, not necessarily chrome, but fixed
Why are you having so much trouble believe this when others are having the issue with Safari (and Safari only) after upgrading to Big Sur?
Obviously there is an issue, could be a compatibility issue with certain machines, maybe certain chips or graphics cards.
Score: 2 Votes (Like | Disagree)
steve333 Avatar
16 months ago

it is simple, if it was safari and safari alone, it would be a universal problem, but it is not. why are you having so much trouble understanding that, it is a simple concept. Now, there may be something going on with people, something specific to their machines certain extension, even malware, even old libraries impacting the performance, but they are not simply Safari. Do a clean install, clean up all the crap, and it will work fine, it did for me.
If it happening only with safari, then it is a safari issue. Everything else, including firefox, works fine.
Score: 2 Votes (Like | Disagree)

Related Stories

Safari Technology Preview Feature

Apple Releases Safari Technology Preview 141 With Bug Fixes and Performance Improvements

Thursday March 3, 2022 4:23 pm PST by
Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced in March 2016. Apple designed the Safari Technology Preview to test features that may be introduced into future release versions of Safari. Safari Technology Preview release 141 includes bug fixes and performance improvements for Web Inspector, CSS, Forms, JavaScript, Experimental ...
Safari Technology Preview Feature

Apple Releases Safari Technology Preview 140 With Bug Fixes and Performance Improvements

Thursday February 10, 2022 1:09 pm PST by
Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced in March 2016. Apple designed the Safari Technology Preview to test features that may be introduced into future release versions of Safari. Safari Technology Preview release 140 includes bug fixes and performance improvements for Web Inspector, CSS, Web API, Web Animations,...
Safari Technology Preview Feature

Apple Adds 120Hz Scrolling for Some Sites in Latest Safari Technology Preview Release [Updated]

Monday November 15, 2021 1:55 pm PST by
Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced in March 2016, and today's update adds 120Hz Safari scrolling on displays that support 120Hz refresh rates. The addition of 120Hz scrolling partially addresses a Safari issue that new MacBook Pro owners have been complaining about since the update was released. As many MacRumors...
Safari Technology Preview Feature

Apple Releases Safari Technology Preview 138 With Bug Fixes and Performance Improvements

Thursday January 20, 2022 5:47 pm PST by
Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced in March 2016. Apple designed the Safari Technology Preview to test features that may be introduced into future release versions of Safari. Safari Technology Preview release 138 includes bug fixes and performance improvements for Web Inspector, CSS, Experimental Model Element,...
Safari Technology Preview Feature

Apple Releases Safari Technology Preview 136 With Bug Fixes and Performance Improvements

Wednesday December 8, 2021 3:12 pm PST by
Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced in March 2016. Apple designed the Safari Technology Preview to test features that may be introduced into future release versions of Safari. Safari Technology Preview release 136 includes bug fixes and performance improvements for CPU, GPU Process, JavaScript, Web API, Media, Web...
Safari Technology Preview Feature

Apple Releases Safari Technology Preview 137 With Bug Fixes and Performance Improvements

Monday December 20, 2021 1:28 pm PST by
Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced in March 2016. Apple designed the Safari Technology Preview to test features that may be introduced into future release versions of Safari. Safari Technology Preview release 137 includes bug fixes and performance improvements for Web Inspector, CSS, JavaScript, WebAssembly,...
Safari Technology Preview Feature

Apple Releases Safari Technology Preview 133 With Bug Fixes and Performance Improvements

Thursday September 30, 2021 10:13 am PDT by
Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced in March 2016. Apple designed the Safari Technology Preview to test features that may be introduced into future release versions of Safari. Safari Technology Preview release 133 includes bug fixes and performance improvements for CSS, CSS Cascade Layers, CSS Font Loading API,...
Safari Technology Preview Feature

Apple Releases Safari Technology Preview 124 With Bug Fixes and Performance Improvements

Friday May 7, 2021 1:38 pm PDT by
Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced in March 2016. Apple designed the Safari Technology Preview to test features that may be introduced into future release versions of Safari. Safari Technology Preview release 124 includes bug fixes and performance improvements for Web Inspector, CSS, JavaScript, Web API, Rendering, ...

Popular Stories

apple ar headset concept 1

Apple's Headset Said to Feature 14 Cameras Enabling Lifelike Avatars, Jony Ive Has Remained Involved With Design

Friday May 20, 2022 6:50 am PDT by
Earlier this week, The Information's Wayne Ma outlined struggles that Apple has faced during the development of its long-rumored AR/VR headset. Now, in a follow-up report, he has shared several additional details about the wearable device. Apple headset render created by Ian Zelbo based on The Information reporting For starters, one of the headset's marquee features is said to be lifelike...
anker 563 dock ports

Anker's Latest USB-C Docking Station Brings Triple-Display Support to M1 Macs

Wednesday May 18, 2022 7:06 am PDT by
While Apple's early M1-based Macs can only officially support a single external display, there are ways around the limitation. Anker is launching a new 10-in-1 USB-C docking station today which delivers just that. The Anker 563 USB-C dock includes two HDMI ports and a DisplayPort port, and it leverages DisplayLink to carry multiple video signals over a single connection. Given that this hub...
apple data auction iphone privacy ad

Apple Highlights iPhone's Latest Privacy Features in New 'Data Auction' Ad

Wednesday May 18, 2022 9:00 am PDT by
Apple today shared a new ad highlighting iPhone privacy features like App Tracking Transparency and Mail Privacy Protection that are designed to give users more transparency and control when it comes to their personal data being collected. The ad revolves around a young woman named Ellie who discovers that her personal data is being sold at an auction house, with bids being placed on her...
Prosser Series 8 3

Apple Watch Series 8 Rumored to Feature New Design With Flat Display

Wednesday May 18, 2022 6:21 am PDT by
The Apple Watch Series 8 could feature an all-new design with a flat display, according to the leaker known as "ShrimpApplePro." In his latest video on the YouTube channel Front Page Tech, Jon Prosser highlighted information from ShrimpApplePro that suggests the Apple Watch Series 8 could feature a flat display in what seems to be a design originally rumored for the Apple Watch Series 7. ...
sony headphones 1

Sony's New WH-1000XM5 Headphones vs. Apple's AirPods Max

Friday May 20, 2022 12:18 pm PDT by
Sony this week came out with an updated version of its popular over-ear noise canceling headphones, so we picked up a pair to compare them to the AirPods Max to see which headphones are better and whether it's worth buying the $400 WH-1000XM5 from Sony over Apple's $549 AirPods Max. Subscribe to the MacRumors YouTube channel for more videos. First of all, the AirPods Max win out when it comes ...
iPhone 14 Purple Lineup Feature

Will the iPhone 14 Be a Disappointment?

Saturday May 21, 2022 9:00 am PDT by
With around four months to go before Apple is expected to unveil the iPhone 14 lineup, the overwhelming majority of rumors related to the new devices so far have focused on the iPhone 14 Pro, rather than the standard iPhone 14 – leading to questions about how different the iPhone 14 will actually be from its predecessor, the iPhone 13. The iPhone 14 Pro and iPhone 14 Pro Max are expected...
apple ar headset concept 2

Apple's AR/VR Headset Nearing Completion as Board Gets Demo

Thursday May 19, 2022 9:52 am PDT by
Apple last week demonstrated its upcoming AR/VR headset to Apple board members, indicating that the device is in an advanced stage of development and could see a debut in the not too distant future, reports Bloomberg. Apple has also ramped up development of the software that runs on the headset, with that software expected to be called "RealityOS," or rOS for short. Render via designer Ian ...