Maybe in straight doom, but I definitely play some lines in Supervoid that push the limits of my playing, including some parts where I'm playing as fast as physically possible.
And I realize you're mostly joking. Just saying, the way I play in Supervoid technique is definitely important.
The timing in some of The 5th Child's stuff is difficult for me, since the guitarist and I are sometimes playing something totally different from what the drummer is playing.
Then some stuff in Catapult the Dead is difficult from a fast perspective.