Akafile gave me ~50KB/s while Anonfiles gave me ~1.5MB/s.
I tested with an Australia VPS. (Akafile doesn't allow my country to download actually)

Hi admin, it would be wonderful if you considered providing PAR2 for uploaded files. It's a great way to fix random damages of data when transferring over internet.

Parchive (a contraction of parity archive volume set) is an erasure code system that uses a parity file format. These parity files are used to perform checksum verification, and can also repair corrupted or missing data. Parchive was originally written to solve the problem of reliably transferring files on Usenet,[1] but it is now commonly used for protecting any kind of data from data corruption, bit rot, and accidental or malicious damage. (copied from Wikipedia)

Here is the test PAR2 for [IB] Mondaiji-tachi ga Isekai kara Kuru Sou Desu yo - 05 [720p] [10bit] [D1705E86].mkv ~~>> http://ge.tt/7BgxLSY/v/0
Program for repairing using PAR2 files (and create them): MultiPar http://hp.vector.co.jp/authors/VA021385/
(5% redundancy - can used to fix the file if damage is 5% or less)

(PAR2 is widely used in Usenet where random data corruption happens all time. It would take some computing resources, though.)