Maybe it's because my server is still on v.1.139.4, but I have had the opposite experience with the new beta timeline on Android. I disabled it after trying it for a week because it took so long for thumbnails to load vs. the stable version. Compared to Google Photos, any version of the Immich timeline I've tried feels extremely clunky. It's a great backup alternative and I commend the team behind it, but it is far from being a product I'd recommend as an everyday photo gallery app.