Fast-CrewAI is a Rust-accelerated drop-in for CrewAI by Neul Labs. 34× faster serialization, 11× faster memory search, 17× faster tool execution — with zero code changes. Consulting, guides, and long-standing CrewAI issue commentary.https://fast-crewai.neullabs.com/en-ushttps://fast-crewai.neullabs.com/knowledge/choosing-a-multi-agent-framework-in-2026/https://fast-crewai.neullabs.com/knowledge/choosing-a-multi-agent-framework-in-2026/An honest comparison of CrewAI, LangGraph, and AutoGen for teams that need to ship. Where each one shines, where each one hurts, and how Fast-CrewAI changes the calculus.Sun, 12 Apr 2026 00:00:00 GMTguidecomparisonlanggraphautogencrewaihttps://fast-crewai.neullabs.com/knowledge/memory-like-query-slowness/https://fast-crewai.neullabs.com/knowledge/memory-like-query-slowness/CrewAI's default RAG storage uses substring LIKE queries against SQLite, which are full table scans. As memory grows, every agent turn pays the full cost of the scan.Sun, 12 Apr 2026 00:00:00 GMTissuememoryhighhttps://fast-crewai.neullabs.com/knowledge/production-crewai-architecture-patterns/https://fast-crewai.neullabs.com/knowledge/production-crewai-architecture-patterns/Architectural patterns for running CrewAI in production: memory layering, RAG pipelines, tool isolation, observability, and where Fast-CrewAI fits into each. Written for architects.Sun, 12 Apr 2026 00:00:00 GMTguidearchitectureproductionraghttps://fast-crewai.neullabs.com/knowledge/fast-crewai-vs-crewai-benchmarks-explained/https://fast-crewai.neullabs.com/knowledge/fast-crewai-vs-crewai-benchmarks-explained/Methodology, raw numbers, and honest caveats behind the 34.5× serialization, 17.3× tool execution, and 11.2× memory search claims. Everything you need to reproduce the results.Sun, 12 Apr 2026 00:00:00 GMTguidebenchmarkperformancemethodologyhttps://fast-crewai.neullabs.com/knowledge/json-serialization-overhead/https://fast-crewai.neullabs.com/knowledge/json-serialization-overhead/Python's json module is the hidden tax on every agent-to-agent handoff. For memory-heavy crews, it can account for 20–40% of CPU time.Sun, 12 Apr 2026 00:00:00 GMTissueserializationmediumhttps://fast-crewai.neullabs.com/knowledge/long-term-memory-unbounded-growth/https://fast-crewai.neullabs.com/knowledge/long-term-memory-unbounded-growth/CrewAI's long-term memory persists everything and has no default retention policy. Over weeks of production use, it grows without limit — degrading search quality and bloating SQLite files.Sun, 12 Apr 2026 00:00:00 GMTissuememoryhighhttps://fast-crewai.neullabs.com/knowledge/missing-observability-hooks/https://fast-crewai.neullabs.com/knowledge/missing-observability-hooks/CrewAI runs produce logs, but the structured spans you'd need for distributed tracing have to be added by hand. When things slow down in production, you're guessing.Sun, 12 Apr 2026 00:00:00 GMTissuegeneralmediumhttps://fast-crewai.neullabs.com/knowledge/rust-python-interop-pyo3-for-ai-agents/https://fast-crewai.neullabs.com/knowledge/rust-python-interop-pyo3-for-ai-agents/A practical look at PyO3, serde, and Tokio in the context of AI agent frameworks. What Rust actually helps with, what it doesn't, and how Fast-CrewAI is structured under the hood.Sun, 12 Apr 2026 00:00:00 GMTguiderustpyo3internalshttps://fast-crewai.neullabs.com/knowledge/repeated-tool-execution/https://fast-crewai.neullabs.com/knowledge/repeated-tool-execution/LLMs call the same tool with the same arguments over and over. CrewAI has no default caching layer, so every invocation pays the full cost — including the ones that are wasteful.Sun, 12 Apr 2026 00:00:00 GMTissuetoolshighhttps://fast-crewai.neullabs.com/knowledge/migrating-to-fast-crewai-zero-code-changes/https://fast-crewai.neullabs.com/knowledge/migrating-to-fast-crewai-zero-code-changes/What the one-line import actually does, how to verify it's active, how to toggle individual components, and how to roll back if something breaks. The honest migration guide.Sun, 12 Apr 2026 00:00:00 GMTguidemigrationgetting-startedcrewaihttps://fast-crewai.neullabs.com/knowledge/sequential-task-scheduling/https://fast-crewai.neullabs.com/knowledge/sequential-task-scheduling/CrewAI's default task scheduler runs tasks in order, even when their dependencies don't require it. Teams leave multi-minute parallelism wins on the table without realizing.Sun, 12 Apr 2026 00:00:00 GMTissuetasksmediumhttps://fast-crewai.neullabs.com/knowledge/tool-validation-overhead/https://fast-crewai.neullabs.com/knowledge/tool-validation-overhead/CrewAI validates tool arguments with Python's jsonschema on every call. For simple tools that return instantly, validation can be 70% of the call cost.Sun, 12 Apr 2026 00:00:00 GMTissuetoolslowhttps://fast-crewai.neullabs.com/knowledge/why-crewai-multi-agent-systems-get-slow/https://fast-crewai.neullabs.com/knowledge/why-crewai-multi-agent-systems-get-slow/A technical walkthrough of the four places CrewAI spends CPU time in real workloads — serialization, memory search, tool execution, and task scheduling — and what you can do about each of them today.Sun, 12 Apr 2026 00:00:00 GMTguideperformancecrewaiarchitecturehttps://fast-crewai.neullabs.com/knowledge/sqlite-connection-contention/https://fast-crewai.neullabs.com/knowledge/sqlite-connection-contention/CrewAI's default memory backend uses a single SQLite connection per process. Under concurrent load, workers serialize through it and throughput collapses.Sun, 12 Apr 2026 00:00:00 GMTissuedatabasemedium