• If you mean Mississippi: look, dude, it's an election, not a spectator sport to give you a dopamine rush. Their counting process can be improved (which local outlets like the Mississippi Free Press have covered), and they brought a lot of the affidavit ballot headache on themselves by improperly purging the voter rolls through known-shitty data as a form of voter suppression, but that doesn't change that the counting process isn't done for your entertainment. As long as everything's counted when the state needs to submit it (and in Mississippi's case, when the counties need to submit to the state), they've done their job.
• If you mean the decision desks who called it, until today's dump from Hinds County, Colom was ahead by only about 2500 votes with about 15,000 more left. Decision desks have a reputation at stake – built up over decades – anytime they call a race, let alone one as watched and consequential as this one.
• And if you mean Hyde-Smith, she did this probably less than an hour after the AP called it. She did this quickly and overall has been basically fine through this process.

Normally, the election boards don’t need to dig into absentee or provisional ballots because the winner has built a large enough lead with the “normal” ballots that they’ve mathematically eliminated their opponent. (They’ll still count them eventually, but they aren’t the deciding votes.) The margins of this race were so thin (less than half a percent) that no one was ready to call it until every vote tallied.