Cursor runs cloud agents in parallel. Devin deploys hundreds of parallel sub-tasks. Factory.ai scripts Droids at massive CI/CD scale. SaaS Factory's unified-loop.ts has PARALLEL_SLOTS hardcoded to 1 and only scales to multiple slots when project health is non-critical. The architecture supports the concept (multiple implementation slots per cycle) but the platform-level agent orchestration is strictly sequential per project. Competitors position parallel execution as a core competitive advantage. The mission statement says '21+ agents working around the clock' which implies parallelism, but the reality is one slot at a time.