is 1Password8 for iOS also electron?

It is really strange you encounter the performance issues on your iPhone. I also have an iPhone 13 Pro and I've put version 8 on my wife iPhone SE from 2016 and as far as performance goes, everything moves fast and without any glitches. I suspect your operating system environment is probably messy (many installed apps, notifications enabled for most of them, background app refresh, storage issues). I suggest you have a look on these, maybe you can tweak some here and there.

Also, did you restored your iPhone from a backup recently? I found that performing a clean reset and install everything on fresh helps, since sometimes backups tend to backup various issues that are unpacked and can wreck your installation when you restore. Just a thought.

Other than that, design wise, things can get subjective. It's new, it's fresh and it can take some time to get used to it. But I will not say is ugly. Things can be improved slightly, here and there, of course, and I'm sure improvements will come in next iterations. 🖖