Solid 2.0 RC Rewrites Async UI

Solid 2 is a deep architectural reset, not a routine framework upgrade—the async model is compelling, but migration costs will be substantial.

• –First-class async removes much of the coordination overhead around resources, Suspense, pending states, and optimistic updates
• –Start mode consolidates SSR, routing, and server functions, reducing fragmentation across the Solid ecosystem
• –The Rust compiler should improve developer feedback loops, though the 355× figure is a workload-specific build benchmark rather than a runtime-performance claim
• –Breaking changes to effects, stores, list rendering, and directives mean Solid 1.x teams should budget for a deliberate migration
• –Ecosystem readiness will determine adoption as much as the technical improvements, particularly for component libraries and routing integrations