Compared to:

• vec – raw std::vector baseline (SoA, theoretical minimum)
• EnTT – is a header-only, tiny and easy to use library for game programming and much more written in modern C++.
• Flecs – Flecs is a fast and lightweight Entity Component System that lets you build games and simulations with millions of entities

Lower values mean better performance.
Bars show relative performance with ecss = 1× as the baseline. Other libraries are divided by the ecss result, so you can directly compare how many times slower or faster they are. Absolute times in microseconds (µs) are available in tooltips when hovering over a bar.

Note: GCC aggressively auto-vectorizes simple loops (vec, Flecs), making them faster on Linux. MSVC doesn't vectorize as well, so ECSS performs better on Windows — the most common platform for game development.