Anime pacing is WOAT. It's like late Frieza saga DBZ but for over 10 years running now. After Enies Lobby Toei got tired of getting low ratings for 10 episode filler arcs so to get around it they just started slowing things down like crazy to avoid catching the manga. That way filler arcs only need to be a couple of episodes. Also why they started doing one hour specials and stuff too.
shyt's agonizing. shyt's not even 1:1 anymore
. They'll take like 8 out of the 13 pages and stretch it all out to 1 episode
. Of course I've heard Oda's made the pacing of the chapters more frenetic and all over the place to help the anime episodes be more active rather than littered with dead air, and also having stuff occur off screen so the anime can do it themselves and stretch things out more.