Benchmark 2025: C++ vs Competitors — The Balance of Power

Benchmark 2025: C++ vs Competitors — Who Wins the Performance Race?

2025 has become a turning point in the world of high-performance computing. While languages like Rust and Go are actively "biting off" niches from classic C++, the latest benchmarks show: the king of performance is in no hurry to give up its crown. We analyzed fresh data from open sources (The Computer Language Benchmarks Game, TechEmpower, and internal tests from major fintech companies) to understand how C++ stacks up against its main competitors today.

Key Benchmark Results for 2025

• Computational tasks (CPU-bound): C++ is still at the top. In tests on sorting, recursive algorithms, and matrix operations, C++ outperforms Rust by an average of 5-8%, and Python by 20-40 times. The main advantage is full control over memory and zero-cost abstractions.
• Memory management and allocations: Here, Rust has unexpectedly closed the gap with C++. Thanks to the ownership model and optimized allocators (jemalloc, mimalloc), Rust loses to C++ by only 2-5% in dynamic allocation tests. However, in scenarios with intensive use of shared_ptr and complex containers, C++ pulls ahead again.
• Web frameworks and network requests: In TechEmpower benchmarks (JSON serialization, databases), C++ (drogon, crow) and Rust (actix-web) are neck and neck. The difference in throughput is less than 3%. Python (FastAPI, Django) lags by an order of magnitude but compensates with development speed.
• Multithreading and asynchrony: C++20/23 with coroutines and std::execution is catching up to async/await in Rust. On synthetic tests with 32 cores, C++ shows better scalability due to custom schedulers. Go, traditionally strong in concurrency, falls behind C++ under peak loads due to goroutine overhead.

Where Does C++ Remain Indispensable?

Despite the rise of Rust and Kotlin/Native, in 2025 C++ dominates in three key areas:

• Game engines and graphics: Unreal Engine 6, Godot 4, and proprietary solutions (NA Tech) are still written in C++. In benchmarks for ray tracing and physics simulations, C++ is 10-15% faster than Rust counterparts.
• Embedded systems and IoT: Microcontrollers with limited memory (ARM Cortex-M, RISC-V) choose C++ due to minimal runtime and predictability. Rust is only gaining ground here but still loses in terms of binary code size.
• Financial algorithms (HFT): Low latency is C++'s calling card. In nanosecond tests (data transfer via DPDK, order book processing), C++ outperforms Rust by 10-20% due to intrinsics and manual SIMD vectorization.

Community Opinion

We surveyed developers at the C++ Russia 2025 conference. The majority agree: in 2025, C++ and Rust are not competitors, but partners. "C++ for the system core, Rust for safe