Aiming for high usability even on restricted networks, Hashtopolis communicates over HTTP(S) using a human-readable, hashing-specific dialect of JSON. The server part runs on PHP using MySQL as the database back end. It is vital that your MySQL server is configured with performance in mind. Queries can be very expensive and proper configuration makes the difference between a few milliseconds of waiting and disastrous multi-second lags. The database schema heavily profits from indexing. Therefore, if you see a hint about pre-sorting your hashlist, please do so.