This post compares each Rails 8 Solid gem with the library it replaces, using current versions: Solid Queue 1.7 (batches, fiber workers, dynamic recurring tasks) vs Sidekiq 8.1, Solid Cache vs Redis, and Solid Cable vs Redis and AnyCable, with the project’s own benchmarks. It covers the production gotchas (retries, killed workers, queue naming, MySQL isolation), a per-component decision table, and an incremental migration path off Sidekiq.