Honestly. I have no problem with long combats. And i'm so glad its not RTwP. Which ultimately takes all the strategy/tactics out of the game by the time you are past the first few levels. It just feels a bit like real DnD, where sometimes combats take a while because of misses/adds etc. But IMHO it makes the end of them so rewarding. You feel like you really solved something epic.
Its possible the ai is struggling with their options. I notice this with the phase spiders for example. But overall, i find the combats pretty fluid. My only frustration is that there is not a function for holding and action, which helps players in real DnD work together/around initiative borks. But overall, I like the fact that you can draw adds and have these huge hard battles that actually make you use all the items you have, the scrolls you have etc. My only wish was that we could have maybe 1 additional short rest per long rest.