(Thanks to Greys for the nice Graph)
SAMD21 Cortex M0+ @ 48MHz:
1KB
Maxim (iButton) FastCRC: Value:0x78, Time: 353 us (23.21 mbs)
Maxim (iButton) builtin: Value:0x78, Time: 2213 us (3.70 mbs)
MODBUS FastCRC: Value:0x2487, Time: 336 us (24.38 mbs)
MODBUS builtin: Value:0x2487, Time: 2337 us (3.51 mbs)
XMODEM FastCRC: Value:0x190E, Time: 339 us (24.17 mbs)
XMODEM builtin: Value:0x190E, Time: 2378 us (3.44 mbs)
MCRF4XX FastCRC: Value:0xF5F5, Time: 338 us (24.24 mbs)
MCRF4XX builtin: Value:0xF5F5, Time: 431 us (19.01 mbs)
KERMIT FastCRC: Value:0x318, Time: 337 us (24.31 mbs)
Ethernet FastCRC: Value:0xE13699FF, Time: 347 us (23.61 mbs)
10KB
Maxim (iButton) FastCRC: Value:0xE8, Time: 3520 us (23.27 mbs)
Maxim (iButton) builtin: Value:0xE8, Time: 22102 us (3.71 mbs)
MODBUS FastCRC: Value:0x27D2, Time: 3344 us (24.50 mbs)
MODBUS builtin: Value:0x27D2, Time: 23381 us (3.50 mbs)
XMODEM FastCRC: Value:0x1A34, Time: 3354 us (24.42 mbs)
XMODEM builtin: Value:0x1A34, Time: 23845 us (3.44 mbs)
MCRF4XX FastCRC: Value:0xE2B8, Time: 3340 us (24.53 mbs)
MCRF4XX builtin: Value:0xE2B8, Time: 4294 us (19.08 mbs)
KERMIT FastCRC: Value:0x2CDC, Time: 3345 us (24.49 mbs)
Ethernet FastCRC: Value:0xB9E598DC, Time: 3434 us (23.86 mbs)
29KB
Maxim (iButton) FastCRC: Value:0x2E, Time: 10189 us (23.32 mbs)
Maxim (iButton) builtin: Value:0x2E, Time: 64098 us (3.71 mbs)
MODBUS FastCRC: Value:0x1315, Time: 9685 us (24.53 mbs)
MODBUS builtin: Value:0x1315, Time: 67821 us (3.50 mbs)
XMODEM FastCRC: Value:0x212B, Time: 9725 us (24.43 mbs)
XMODEM builtin: Value:0x212B, Time: 69129 us (3.44 mbs)
MCRF4XX FastCRC: Value:0x7FFE, Time: 9685 us (24.53 mbs)
MCRF4XX builtin: Value:0x7FFE, Time: 12445 us (19.09 mbs)
KERMIT FastCRC: Value:0x7C4, Time: 9684 us (24.53 mbs)
Ethernet FastCRC: Value:0x612BCE88, Time: 9958 us (23.86 mbs)
SAMD51 Cortex M4 @ 120MHz:
1KB
Maxim (iButton) FastCRC: Value:0x78, Time: 104 us (78.77 mbs)
Maxim (iButton) builtin: Value:0x78, Time: 685 us (11.96 mbs)
MODBUS FastCRC: Value:0x2487, Time: 59 us (138.85 mbs)
MODBUS builtin: Value:0x2487, Time: 675 us (12.14 mbs)
XMODEM FastCRC: Value:0x190E, Time: 60 us (136.53 mbs)
XMODEM builtin: Value:0x190E, Time: 744 us (11.01 mbs)
MCRF4XX FastCRC: Value:0xF5F5, Time: 59 us (138.85 mbs)
MCRF4XX builtin: Value:0xF5F5, Time: 120 us (68.27 mbs)
KERMIT FastCRC: Value:0x318, Time: 59 us (138.85 mbs)
Ethernet FastCRC: Value:0xE13699FF, Time: 66 us (124.12 mbs)
10KB
Maxim (iButton) FastCRC: Value:0xE8, Time: 1027 us (79.77 mbs)
Maxim (iButton) builtin: Value:0xE8, Time: 6838 us (11.98 mbs)
MODBUS FastCRC: Value:0x27D2, Time: 520 us (157.54 mbs)
MODBUS builtin: Value:0x27D2, Time: 6753 us (12.13 mbs)
XMODEM FastCRC: Value:0x1A34, Time: 523 us (156.63 mbs)
XMODEM builtin: Value:0x1A34, Time: 7437 us (11.02 mbs)
MCRF4XX FastCRC: Value:0xE2B8, Time: 523 us (156.63 mbs)
MCRF4XX builtin: Value:0xE2B8, Time: 1197 us (68.44 mbs)
KERMIT FastCRC: Value:0x2CDC, Time: 523 us (156.63 mbs)
Ethernet FastCRC: Value:0xB9E598DC, Time: 552 us (148.41 mbs)
29KB
Maxim (iButton) FastCRC: Value:0x2E, Time: 2976 us (79.83 mbs)
Maxim (iButton) builtin: Value:0x2E, Time: 19827 us (11.98 mbs)
MODBUS FastCRC: Value:0x1315, Time: 1496 us (158.80 mbs)
MODBUS builtin: Value:0x1315, Time: 19580 us (12.13 mbs)
XMODEM FastCRC: Value:0x212B, Time: 1497 us (158.70 mbs)
XMODEM builtin: Value:0x212B, Time: 21563 us (11.02 mbs)
MCRF4XX FastCRC: Value:0x7FFE, Time: 1497 us (158.70 mbs)
MCRF4XX builtin: Value:0x7FFE, Time: 3471 us (68.44 mbs)
KERMIT FastCRC: Value:0x7C4, Time: 1496 us (158.80 mbs)
Ethernet FastCRC: Value:0x612BCE88, Time: 1564 us (151.90 mbs)
63KB
Maxim (iButton) FastCRC: Value:0xC6, Time: 6461 us (79.88 mbs)
Maxim (iButton) builtin: Value:0xC6, Time: 43071 us (11.98 mbs)
MODBUS FastCRC: Value:0x24D4, Time: 3240 us (159.29 mbs)
MODBUS builtin: Value:0x24D4, Time: 42533 us (12.13 mbs)
XMODEM FastCRC: Value:0xFC6C, Time: 3241 us (159.24 mbs)
XMODEM builtin: Value:0xFC6C, Time: 46840 us (11.02 mbs)
MCRF4XX FastCRC: Value:0x5372, Time: 3242 us (159.19 mbs)
MCRF4XX builtin: Value:0x5372, Time: 7539 us (68.46 mbs)
KERMIT FastCRC: Value:0xE0E9, Time: 3240 us (159.29 mbs)
Ethernet FastCRC: Value:0x8BBB4973, Time: 3395 us (152.02 mbs)