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!