CPU Test Online
Measure your processor's performance and stability with our browser-based CPU test. Adjust settings and see how your CPU handles the load.
Test Configuration
Understanding Browser-Based CPU Tests:
This test runs within your browser's JavaScript engine. Results reflect the performance of JavaScript execution on your CPU, which can be influenced by browser type, version, active extensions, and background processes. For precise hardware benchmarking, dedicated native applications are recommended. This tool is excellent for comparative analysis within the browser environment or for a general assessment of web-related CPU tasks.
How to run a CPU stress test online
Use this browser CPU benchmark to measure processor speed, multi-thread behavior, short stress-load stability, and signs of throttling during JavaScript workloads.
Choose the right workload
Use Light for a quick processor check, Moderate for a normal browser CPU benchmark, and Heavy when you want a stronger CPU stress test online. Close background apps before comparing results.
Read the score correctly
Operations per second reflects how quickly your CPU completes the workload in the browser. A sharp drop between runs can point to thermal throttling, battery saver, or another app using CPU time.
Compare with GPU results
If games or WebGL apps feel slow, run both CPU and GPU tests. A strong GPU with a weak CPU score can indicate a processor bottleneck, while low scores on both can point to power or cooling limits.
Related hardware tests
Frequently Asked Questions (FAQ)
What does this CPU test measure?
This tool measures how quickly your CPU can perform a series of complex JavaScript calculations. It's a good indicator of your processor's performance for web browsing, web applications, and other JavaScript-heavy tasks.
How do I interpret the 'Operations Per Second (OPS)' score?
A higher OPS score generally means better performance. This score can be used to compare different CPUs or to see how changes in your system (like closing background apps) affect performance. It's most useful for relative comparisons.
Why use Web Workers?
Web Workers allow the CPU-intensive calculations to run in background threads without freezing your browser window. This provides a smoother user experience and allows for more realistic multi-threaded testing.
Can this test damage my CPU?
No. While this test can put a significant load on your CPU (especially with high thread counts and heavy workloads), modern CPUs have built-in thermal protection to prevent damage from overheating. If your system has inadequate cooling, it might slow down (throttle) or shut down to protect itself, but the test itself is safe.
How does 'Number of Threads' affect the test?
Setting a higher number of threads allows the test to utilize more of your CPU's cores, potentially leading to a higher total OPS if your CPU can handle the parallel tasks efficiently. Using a number close to your CPU's core/thread count is often optimal.
Are results comparable across different browsers or devices?
Results can vary between different browsers (Chrome, Firefox, Safari, Edge) due to differences in their JavaScript engines. Similarly, results will differ significantly across devices (desktop, laptop, mobile) based on their CPU architecture and power. For the most consistent comparisons, use the same browser and device.