Download the 2026 RTOS Performance Report

An independent benchmark of 8 embedded RTOSes on real Cortex-M hardware using the Eclipse Thread-Metric test suite. See how each one actually compares on the metrics that matter for shipping firmware.

What’s inside

• 8 RTOSes tested with pinned versions:
  • PX5 5.3.1
  • ThreadX 6.5.1
  • FreeRTOS 11.3.0
  • Zephyr 4.4.1
  • Arm Keil RTX5 5.9.1
  • RT-Thread
  • NuttX
  • Micrium µC/OS-III
• 9 native API tests: basic processing, cooperative & preemptive scheduling, memory allocation, message processing, synchronization, interrupt processing, interrupt preemption, and interrupt latency (oscilloscope study)
• POSIX API benchmarks comparing which RTOS is fastest via POSIX and how the ranking differs from native
• Year-over-year progress: 2024 vs 2026 for FreeRTOS, ThreadX, Zephyr, and PX5
• Deep-dive appendices: cross-architecture (M4F vs M33), IAR vs GCC compiler effects, application-vs-RTOS-build optimization levers, and the safety-feature cost profile

Free download. No sales calls. Just data.

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