python's hashlib is one of the fastest. I initially used shasum -a 256 in bash, and it took days. Hashlib took me a minute and a half.

Keep in mind you are comparing the integer values of the hashes, NOT the hash themselves.

Also, despite the solution saying it should be a simple concatenation of the largest and then smallest, or 'largest' + 'smallest', it is actually 'largest' + ',' + 'smallest'.