This pre-release use patform native call to copy files. On windows, this is `CopyFile2()` and on linux it uses special ioctl call do do server-side copy on samba shares. This is faster then on v1.x as there is no overhead from subprocess call to xcopy,
Size (Mb) | Python (win) | Speedcopy (win) | Python (linux) | Speedcopy (linux) | xcopy (win) | Win speedup | Linux speedup | speedcopy vs xcopy
-- | -- | -- | -- | -- | -- | -- | -- | --
1 | 0,08 | 0,02 | 0,07 | 0,01 | 0,15 | 3,59 | 6,89 | 6,02
2 | 0,17 | 0,03 | 0,09 | 0,01 | 0,16 | 6,70 | 8,51 | 5,79
4 | 0,33 | 0,03 | 0,13 | 0,01 | 0,16 | 12,02 | 11,14 | 4,84
8 | 0,67 | 0,03 | 0,19 | 0,01 | 0,17 | 19,97 | 13,26 | 4,35
16 | 1,36 | 0,04 | 0,29 | 0,02 | 0,18 | 35,29 | 14,78 | 2,82
32 | 2,36 | 0,06 | 0,47 | 0,03 | 0,20 | 37,78 | 16,40 | 0,20
64 | 57,45 | 0,98 | 8,01 | 0,47 | 2,24 | 58,88 | 16,95 | 13,44
128 | 10,93 | 0,17 | 1,33 | 0,23 | 0,31 | 65,48 | 5,77 | 0,13
256 | 20,38 | 2,28 | 2,66 | 0,48 | 2,95 | 8,96 | 5,56 | 0,74
512 | 35,95 | 4,00 | 5,38 | 0,98 | 4,42 | 8,99 | 5,49 | 0,16
1024 | 65,63 | 28,03 | 10,33 | 2,92 | 30,33 | 2,34 | 3,54 | ~0