Did you try Yana and Voyage? Those are much faster than Amethyst.
I didn't say I am unaware of the performance issues we have, but for some devices, people just won't be able to run Amethyst. It's not designed for them. In order to make some stuff work in some phones, I need to make things worse for everybody else.
For instance, loading could be much faster on Amethyst, but I had to reduce the speed to minimize battery drain. So, it usually takes a second between the event coming to the phone and a screen update, instead of updating the screen immediately multiple times a second as things come. In this case, I specifically chose a slower approach to expand the number of devices we can run on. And that was terrible for some users. But most people didn't notice at all.
But that has a limit. After some point each percentage point in coverage might make things more visible to the rest of users. I am constantly searching for things that don't affect the other users. The easiest one is to just remove all of our feeds and features.
For instance, if I don't load NIP-17 DMs, then the app is already almost 5x the loading performance simply because receiving DMs and building the user list for of the latest chats is quite a task (decrypting every message).