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While I haven't used Hey yet, I find Notion on iOS to feel very sluggish and out of place compared to native apps. That's not a benchmark at all in my opinion.

Switching between pages is pretty hit or miss for me in Notion. If it's a page I've been to recently it's very fast, but it's noticeably slow on some page loads. hey seems consistently pretty-fast.

Moving around elements doesn't seem like a fair thing to compare to navigating around the app... that's more like looking at how smooth text editing feels in Hey.

Which is also running on Rails if I remember correctly.

But Notion seems to be those extremely extremely rare examples.