It doesn't help that Catalina seems to have some serious performance regressions. As one of may examples, set up an SMB3 connection to a network-attached stora

It doesn't help that Catalina seems to have some serious performance regressions. As one of may examples, set up an SMB3 connection to a network-attached storage device and then write a short program that uses two or three threads that walk a big director calling stat and lstat on every file. For large complex file hierarchies, Catalina (unlike Mojave) will start stuttering the entire UI and media playback. "rclone" with --transfers=3 can bring a 2019 mbp to its knees, like Windows 3.1 writing to a floppy disk.