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COSMIC lock screen will be customizable with themes
(fosstodon.org)
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Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Rust wouldn't necessarily make it more responsive. It is more oriented towards safety and robustness.
Cosmic might be more responsive / efficient due to the fact that it's a new development and they can choose to implement things better and not carry old baggage, but that's about it. Rust doesn't have much say in it.
Edit: Although, if they are moving away from JavaScript in Gnome as their shell language to pure Rust in Cosmic, then you would probably see some responsiveness / efficiency gains, yes.