Are we talking about the same Obsidian app? The knowledge base / markdown editor?
The iOS Obsidian app doesn't feel native at all, the interface is high latency, syncing is slow and problematic, many plugins don't work, poor touch support and serious performance issues even on the new iPhone 14 Pro.
It feels like a cheap and nasty Electron / JS heavy web frame.
Yup the markdown knowledge app hah. It could very well be the experience on iOS is worse. I'm using it on Android with the Pixel 6 and it's smooth as butter.
For sync though I can't comment as I use syncthing.
edit: Actually you're right, now that you've pointed it out I do notice slightly higher latency and animation hitches. Goes to show if you know that to look for you'll find the cracks!
There are some UX decisions that I disagree with but I feel the underlying tech stack is solid (fast, looks good, feels native, etc)