What's the point of sleep(1) in hashOfFileAtPath method?

[mixtly87]

I have to calculate md5 hash of many files. Each file takes at least 1s because of intentional sleep(1). What's the purpose of the sleep since it's a major performance issue for me?

AWFileHash/Pod/Classes/AWFileHash.m

Line 169 in 78ebdc7

sleep(1);