Look, I get that this is a beta. I saw it in beta 1 and didn't report it, but it is now WORSE in beta 2. I'm hoping other people can test - is this just me? My Samsung EVO 840 is benchmarking at 24MB/s write and 19MB/s read. I mean, I totally expect with OS logging and whatnot that things would be slower, but... MAN.
It took me five days to decrypt the drive, but once decrypted, the performance improved by ONE HUNDRED TIMES. Something is horribly wrong with Catalina’s accessing encrypted volumes... -Verxion