AES cipher algo (AES-NI) is the fastest if you have the necessary hardware. Twofish cipher algo (x86_64, 3-way parallel) is a close second, but will slow access down slightly. Serpent is also usably fast.
CONFIG_CRYPTO_AES_NI_INTEL = ~200mb/s (limited by disk in my case)
CONFIG_CRYPTO_TWOFISH_X86_64_3WAY = ~130mb/s
`cryptsetup --cipher {twofish,aes}-xts-plain64 --key-size 512 --hash
sha512 --iter-time 5000`
