[DesertVarnish]

Most of the time an application built using web technologies is slow, it's not because the web's UI layer (HTML/CSS) is intrinsically slow.

A desktop app written in Tauri that punts most of the heavy data processing to Rust with a UI layer written in well-optimized React or Solid.js is really plenty fast. In practice what we get with most Electron apps is not especially well written React with frequent coarse grained re-renders, inefficient data processing, frequent allocations causing GC pressure, and excessive JSON RPC. The problems here aren't HTML/CSS + JS for basic event handling, it's everything else about how the software is developed.