ARM Performix is a new performance analysis toolkit built in collaboration with Microsoft, designed for workloads running on Azure Cobalt (ARM-based) instances. It provides a UI and CLI with 'recipes' (experiments) and 'targets' (systems) to guide performance investigations from broad system characterization down to CPU microarchitecture analysis. Key recipes include system characterization (microbenchmarks, memory bandwidth/cache), system utilization (per-core CPU heat maps), code hotspots (sampling across all languages including Java), instruction mix comparisons (e.g., ARM NEON vs SVE), and CPU top-down microarchitecture analysis. Performix also exposes an MCP server to integrate profiling data, disassembly, and source code with an LLM (e.g., in VS Code) for dynamic, AI-assisted optimization suggestions. The tool is free to download and use.