There are plenty of valid ways to play D&D, and they might not all have a slow pace. But it's very easy for D&D to end up pretty slow.
In a combat scene with 4 party members and 4 enemies, 7/8 of the time it's not your turn. And if you're playing a simple character that just hits with a sword, while other players are wizards with dozens of spells to choose between their turns will naturally take longer.
In a combat scene with 4 party members and 4 enemies, 7/8 of the time it's not your turn. And if you're playing a simple character that just hits with a sword, while other players are wizards with dozens of spells to choose between their turns will naturally take longer.
Computer games are much faster paced.