When trying to save Minecraft games. The Save takes 5 minutes or longer. I have tested this with Minecraft Java edition 1.19 (latest), and 1.18.2 (last release), both have the same problem with this launcher. This was not present with previous launcher version.
I have also found in a couple of instances that the save does not complete correctly & is corrupted on next load.
I have disabled all third party applications, including antivirus, all of which caused no issues with previous launcher. This has made no difference.
I have made sure that my Windows 10, and Java are up to date & fully patched.
No new software / hardware has been installed before the installer was updated to 2.3.228.
Please check if this is still an issue for you in 1.19.4 or later.