Iris looks good, too, and if it's fast and low on RAM consumption as you describe, it'll be great once it works with private key managers, like Alby or nos2x. In the mean time, I don't trust a web app with my secret keys.
Wow. That's really interesting. I use a Linux laptop Ubuntu 22.10 and the Brave browser. I know the developers have a telegram group that might be able to provide some insight.
I recently discovered Iris as a web app, and it's become my go to client. It's intuitive and very fast, without using up all my ram.