Extremely slow. Used when somebody takes too much time than expected to perform a task and because of that other peoplestart to desperate and in some cases, getting angry by the one performing the task.
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!