https://bugs.winehq.org/show_bug.cgi?id=42104
--- Comment #2 from AshleyJade k638540@mvrht.com --- Well, make your own simple tests. Before writing this I asked a friend to make splitted archive on his Ubuntu and he confirmed this. Calculating checksum lasts about 5 seconds. Normally there is no delay at all (only a small fraction).
I can't test other linux filesystems, because it is a dedicated server and I am not admin there. :)
Also, native rar for linux, exactly same version 5.40, exactly same parameters to make archive - no lag on EXT4. Only WinRAR has lag.