GoKawiilBenchmark finds WSL3 outperforms WSL2 by up to 61% on memory tasks
An independent benchmark comparing Microsoft's WSL 2.6.3.0 (Linux kernel 6.6.87.2) against the newer WSL 3.0.2.0 (kernel 6.18.40.1) found measurable gains across syscall throughput, scheduler latency, and memory bandwidth. The tests, run on an Alpine Linux 3.23.0 guest with Go 1.27.1 on an Intel i5-8500T host, showed improvements ranging from about 4% on basic syscalls to over 61% on sequential memory copy bandwidth, with context-switch latency dropping roughly 11%.
GoKawiil's interpretation of the reporting above, not reported fact.
These results suggest the jump to a much newer Linux kernel (6.18 vs 6.6) inside WSL3 delivers real, measurable improvements for developers running compute- or memory-intensive workloads on Windows, not just marketing claims. The scale of the memory bandwidth gain in particular could matter for data-heavy or I/O-bound development tasks, though actual impact will vary by workload and hardware configuration.
- WSL3 upgrades the guest Linux kernel from 6.6 LTS to 6.18, the main driver of performance changes.
- Memory bandwidth saw the largest improvement, up 61.35% in sequential memcpy tests.
- Scheduler-related metrics like context switch latency and process ping-pong throughput improved 10-13%, while basic syscall gains were smaller at under 4%.
Crucial 32GB DDR4 RAM Kit — If you're running WSL workloads like Go compiles and kernel benchmarks, more memory headroom makes a real difference when allocating resources via .wslconfig. Upgrading a machine like the HP ProDesk from 16GB to 32GB of DDR4 gives you breathing room to bump WSL's memory allocation without starving the host OS. It's a simple, affordable way to get more out of benchmarking and dev work on older hardware.
See Crucial 32GB DDR4 RAM Kit on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: tonym.us — Tony Metzidis, 2026-10-07
Published there as: “WSL3 Performance is about 5-60% faster than WSL2 depending on the workload”
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