'Multithreading' parameter on 'General' page of WinRAR settings is replaced with 'Threads' input field, where you can specify the desired number of CPU threads.Command line -mt switch accepts values from 1 to 64.
Maximum number of utilized threads is increased from 32 to 64.'Fastest' method (-m1 command line equivalent) typically achieves a higher compression ratio for highly compressible data types when creating RAR5 archives.
