Apple Seeds Third Beta of macOS Ventura 13.4 to Developers
Apple today seeded the third beta of macOS Ventura 13.4 to developers for testing purposes, with the beta coming two weeks after the launch of the second beta.

Registered developers can download the beta through the Apple Developer Center and after the appropriate profile is installed, with the betas available through the Software Update mechanism in System Settings.
macOS 13.4 adds the simplified beta installation method that was first introduced in iOS 16.4. With the update, developers and public beta testers enrolled in Apple's respective programs can toggle on beta updates from System Settings on the Mac, without the need to install a profile.
An Apple ID associated with either a public beta account or a developer account is required to turn on beta updates, which means that it is no longer possible to use a developer profile not associated with a developer account to install the developer betas.
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[HEADING=2]Apple Studio Display ('https://developer.apple.com/documentation/macos-release-notes/macos-13_4-release-notes#Apple-Studio-Display')[/HEADING]
[HEADING=3]Known Issues ('https://developer.apple.com/documentation/macos-release-notes/macos-13_4-release-notes#Known-Issues')[/HEADING]
* Apple Studio Display firmware update starts showing progress but never completes. (107287354)
Workaround: To install other updates including future macOS Beta Updates, click “More info…” in Software Update Settings, uncheck Apple Studio Display firmware update, and click “Install Now.”
[HEADING=2]CSS ('https://developer.apple.com/documentation/macos-release-notes/macos-13_4-release-notes#CSS')[/HEADING]
[HEADING=3]Resolved Issues ('https://developer.apple.com/documentation/macos-release-notes/macos-13_4-release-notes#Resolved-Issues')[/HEADING]
* Fixed increasing column-count above 2 not updating the layout. (71808738)
[HEADING=2]File Bookmark ('https://developer.apple.com/documentation/macos-release-notes/macos-13_4-release-notes#File-Bookmark')[/HEADING]
[HEADING=3]Resolved Issues ('https://developer.apple.com/documentation/macos-release-notes/macos-13_4-release-notes#Resolved-Issues')[/HEADING]
* Fixes a regression in macOS Ventura 13.3 where a security check causes bookmark resolution to fail when the path contains Unicode characters stored with composed normalization. As an example, this prevented files in Finder from opening when double-clicked. (107550080)
[HEADING=2]SwiftUI ('https://developer.apple.com/documentation/macos-release-notes/macos-13_4-release-notes#SwiftUI')[/HEADING]
[HEADING=3]Resolved Issues ('https://developer.apple.com/documentation/macos-release-notes/macos-13_4-release-notes#Resolved-Issues')[/HEADING]
* Fixed: Using ImageRenderer within a ShareLink’s preview closure crashed the running application. (107763234)
[/SPOILER]
https://browserbench.org/Speedometer2.1/
Its no slouch
The symptoms of this is the external monitor will lock up, but you can continue to work and shut down apps. If you try to disconnect and reconnect the external monitor you'll get a full freeze / KP. So your only option is to save your work and do a regular restart.