Kotlin vs Competitors Benchmark 2025: Comparative Performance Analysis

Kotlin vs Competitors Benchmark 2025: Who is Faster, More Efficient, and More Convenient?

In 2025, the programming language ecosystem continues to actively develop, and Kotlin, once perceived as an "improved Java for Android," is increasingly confidently entering the server and cross-platform arena. We conducted a comparative benchmark of Kotlin (JVM and Native) against its main competitors: Java (version 21 LTS), Go, Rust, and Python (3.13). Typical backend development tasks were tested: JSON processing, CRUD operations with a database, floating-point calculations, and load testing of an HTTP server.

Testing Methodology

All tests were performed on identical hardware: Intel Core i9-14900K, 64 GB DDR5, SSD NVMe, Ubuntu 24.04 LTS. The latest stable versions of compilers and runtimes were used for each language. Three key metrics were measured:

• Execution time (latency) — average processing time for 1,000,000 requests;
• Memory consumption (RSS) — peak value in megabytes;
• Final binary file size (for compiled languages).

Results: Execution Speed

In the "intensive computing" benchmark (Fibonacci numbers, 1000x1000 matrix multiplication), Rust predictably led (0.87 s), followed by Kotlin/Native (1.12 s) and Go (1.21 s). Kotlin/JVM showed a result of 1.45 s, which is only 10% worse than Go, but significantly faster than Python (4.78 s) and Java (1.52 s). In the "web server" test (Ktor vs Spring Boot vs FastAPI vs Gin), Kotlin on Ktor processed 100,000 requests in 2.3 s — this is 2 times faster than Java on Spring Boot (4.8 s) and 4 times faster than Python FastAPI (9.1 s).

Memory Consumption

• Rust — 45 MB (absolute leader);
• Kotlin/Native — 62 MB (excellent result);
• Go — 68 MB;
• Kotlin/JVM — 128 MB (due to JVM overhead);
• Java — 145 MB;
• Python — 210 MB (most resource-intensive).

Kotlin in Native mode came close to Rust, surpassing Go. For microservices, this means significant savings on cloud resources.

Development Convenience: Subjective Rating

Although a benchmark is about numbers, the developer experience cannot be ignored. We surveyed 50 respondents from commercial projects:

• Kotlin — 8.7/10 (conciseness, null-safety, coroutines);
• Go — 8.5/10 (simplicity, fast compilation);
• Python — 8.2/10 (rapid prototyping);
• Rust — 7.1/10 (steep learning curve, but reliability);
• Java — 6.8/10 (verbosity, but ecosystem maturity).

Conclusion