

Improves the reliability of AirPort connections, including improvements when roaming in large wireless networks with an Intel-based Mac. Improves reliability of Address Book syncing with iPhone and other devices and applications. Some features may not be available for all regions, or on all Apple devices.(Please note: All the features were from the Apple Support site). Fixes an issue where the Reduced Motion Accessibility preference did not reduce the speed of animations in a FaceTime group call.Resolves a stability issue when transferring large amounts of data to RAID volumes.Fixes a stability issue with uploading and downloading media files from iCloud Photo Library while your Mac is asleep.Addresses an issue for Mac computers with the Apple T2 Security Chip where internal speakers may not appear as a sound output device in Sound preferences.

Resolves an issue where the built-in camera may not be detected when trying to use it after using a video conferencing app.


MacOS Catalina 10.15.5 introduces battery health management in the Energy Saver settings for notebooks, an option to control automatic prominence of video tiles on Group FaceTime calls, and controls to fine-tune the built-in calibration of your Pro Display XDR.
