Skip to main content

How Powerful Is Your CPU?

View your CPU's logical core count and run a quick benchmark to estimate single-thread and multi-thread performance — all processed locally in your browser.

This tool reads your CPU's logical core count via navigator.hardwareConcurrency and optionally runs a computational benchmark to estimate processing power relative to reference devices.

navigator.hardwareConcurrency returns logical cores (including hyper-threaded virtual cores), so a 6-core CPU with hyper-threading reports 12 logical processors.

What Do Your Results Mean?

Result Range Meaning
Good 8+ logical cores, high benchmark score Your CPU has strong multi-threaded capacity. Suitable for demanding web applications, heavy multitasking, and parallel workloads.
Warning 4–7 logical cores, moderate benchmark score Adequate for most web tasks and moderate multitasking. May slow down with many concurrent heavy operations.
Bad 1–3 logical cores or low benchmark score Limited processing power. Complex web apps, heavy JavaScript computation, and parallel tasks will feel sluggish.

Common Issues and How to Fix Them

Core count shows lower than expected

Some browsers limit the reported core count for privacy (e.g., Firefox may report fewer cores). Virtual machines and containers also limit visible cores. Check your OS system info to confirm actual core count.

Benchmark score seems unusually low

Close other CPU-intensive applications and browser tabs before running the benchmark. CPU throttling due to overheating or power-saving mode can also reduce scores. Ensure your device is plugged in and not thermal throttling.

Related Tools

Memory Info

Check device RAM info

Browser Benchmark

Benchmark your browser's performance

Device Summary

Complete hardware overview

Frequently Asked Questions

How does the CPU info tool work?

It uses navigator.hardwareConcurrency to detect the number of logical CPU cores available to the browser. The optional benchmark runs mathematical computations to measure single-threaded and multi-threaded processing speed.

What is the difference between physical and logical cores?

Physical cores are actual hardware processing units. Logical cores include virtual cores created by hyper-threading (Intel) or SMT (AMD), which allow each physical core to handle two threads simultaneously. A 4-core CPU with hyper-threading shows 8 logical cores.

Why might the browser report fewer cores than I have?

Browsers may reduce the reported core count for fingerprinting protection. Firefox, for example, may round down or limit the value. Privacy extensions and browser settings can also affect the reported number.

Is any CPU data sent to a server?

No. Core detection and benchmarking run entirely in your browser using JavaScript. No hardware information or benchmark results are transmitted to any external server.