Interesting, I didn't know they moved to a Chromium based desktop application. But honestly, I don't feel like there's any performance issues with the steam desktop client (I'm running it on Fedora, but I'm assuming performance is relatively similar on different platforms).

Ref: https://docs.steambrew.app/developers/environment

The switch from IE/Trident to Chromium happened in 2010 alongside launching support for Macs.