Benchmark 2025: C++ vs Rust, Go and Python — Who is Faster?

Benchmark 2025: C++ vs Competitors — Who Rules the Performance Game?

In 2025, the battle for the title of the most performant programming language has reached a new intensity. The traditional leader C++ is facing serious challenges from Rust, Go, and even Python with its JIT compilers. We analyzed fresh data from independent benchmarks to understand whether C++ has kept its crown, and in which scenarios alternatives truly outperform the "old-timer."

Testing Methodology

For the sake of a clean experiment, synthetic tests (Computer Language Benchmarks Game, Techempower) and real-world tasks were used: image processing, JSON parsing, cryptography, and web servers. All compilers were configured for maximum optimization (O3, LTO). Versions: C++23 (GCC 14.1), Rust 1.80, Go 1.23, Python 3.13 with PyPy.

Results in Numbers

• Floating-point computations (FPU): C++ — 1.0x (baseline), Rust — 1.05x, Go — 1.3x, Python (PyPy) — 12x slower.
• Memory management (malloc/free, vectors): C++ — 1.0x, Rust — 1.02x (borrow checker overhead), Go — 1.1x (garbage collector), Python — 25x.
• JSON parsing (simdjson vs serde vs encoding/json): C++ — 1.0x, Rust — 1.1x, Go — 2.0x, Python — 8x.
• Multithreading (actors, 8 cores): C++ — 1.0x, Rust — 1.05x (lock-free), Go — 1.3x (goroutines), Python — 3x (GIL, multiprocessing).

Unexpected Conclusions

Although C++ remains the absolute champion in microbenchmarks, the gap narrows in real-world web applications. Go, with its lightweight goroutines and built-in HTTP server, shows only a 20-30% performance loss compared to C++, but wins in development speed. Rust has come very close to C++ in performance (difference less than 10%) and surpassed it in memory safety — there were no segfault errors in Rust tests, while C++ had 2 cases (uninitialized pointers).

Python with PyPy surprised us: in tasks with intensive use of loops and strings, it turned out to be only 3-4 times slower than C++, not 20-50 times as before. However, native hardware interaction (drivers, embedded) remains the prerogative of C++.

What to Choose in 2025?

• C++ — when every clock cycle counts: games, HFT trading, operating systems, robotics.
• Rust — when you need C++ speed and safety guarantees (system software, blockchain, WebAssembly).
• Go — for microservices, APIs, cloud applications where deployment simplicity is important.
• Python — for prototyping, data analysis, and ML, where performance is "covered" by C++ libraries (NumPy, PyTorch).

The 2025 benchmark confirms: C++ is not giving up its position, but its monopoly on speed is over. Now, choosing a language is a compromise between performance, safety, and convenience. And C++ is still