Dealing with revolts?

[Oberst]

I find the peasant uprisings in this game infuriating to deal, especially considering the rebel stacks are roughly the size of my largest land army and have the latest tech!

[Dedistrub]

Just hit them with a large army consisting of a good amount of cavalry. Rebels don't do so well against cavalry. Another way to deal with them is to just ignore them, in some cases. Their numbers will fall due to attrition if the province can't supply their siege and then they'll be too small to continue their siege and eventually just disappear.

[sippy cup]

part of the solution is prevention. Check the revolt risk in the province window. A tool tip will explain the causes of unrest, usually a religion, nationalism or culture issue. If its religion you may need to adjust the tolerance sliders. Nationalism you just have to wait for it to expire. Unaccepted cultures may increase revolt risk, but again you can't do much about it, eventually though your nation may accept the "offending" culture.

If you do get a revolt, let them stew for a bit if you can, as the OP said attrition will whittle them down (attrittion is high during winter months). When you do attack them, hit em hard with as much cavalry as you can, use a good leader if you have one, and don't worry so much if your army loses the first round. If you lose, rinse and repeat, you can reinforce, they cannot.

If you have a province with a high revolt risk and you can't do anything about it right away, station some troops there, it seems like they have a hard time if they have to fight right away