The reasons I thought it was slow:
1. The whole bedpan washing was overdone, IMO. 3 times was enough but it just seemed like they kept showing it. We get it, he cleans the poop, like everyday for forever.
2. Unless Arya doesn't go to Westeros to kill Cersei, I didn't see the point of her encounter with the "everyday" Kings Landing Army men.
3. The walk up to Dragonstone. We get it, it's a long freaking way from the initial gates to the castle.
Maybe they could have trimmed some of these scenes and added more in other spots. Like maybe some more of Bran arriving at the Wall or even to castle Black.
Agree on the bedpan washing stuff. I was getting nauseous watching it.
I think the Arya scene meant something. Not sure if it was to humanize and wisen her a bit or what, but the point was obviously that just because you fight on the side of an evil person, it doesn't mean you are evil. It may play a part later in her having mercy on someone (Jamie?)
I actually loved how they drew out the Dragon Stone scene. I mean, Danni landing in Westerose is the thing we've been waiting on for a number of years now.
So many characters reached a turning point/life defining moment in the last 3 episodes. Dani is Home, and her true war begins. Cercie finally became queen. Jon is home, and has become what his father and Brother never really were, and has finally truely "killed the boy". Sansa has finally "Killed the girl". Arya has also "killed the girl" to an extent and embarks on her calling. Bran realizes his calling. The Hound is finding himself.