Question 1

What does the Browser Benchmark test measure?

Accepted Answer

The benchmark runs four JavaScript sub-tests to measure different aspects of browser performance. The Math test executes one million square root operations to measure floating-point throughput. The DOM test creates and removes 1,000 elements to measure document manipulation speed. The String test performs one million concatenations to measure string handling. The Array test sorts 100,000 random numbers to measure algorithm performance. Each sub-test is scored relative to a mid-range baseline and combined into an overall score.

Question 2

Why do scores vary between runs?

Accepted Answer

JavaScript engine performance is not perfectly deterministic. Scores can vary due to JIT (just-in-time) compiler warmup, garbage collection pauses, CPU thermal throttling, background browser tasks, and OS scheduling. For the most consistent results, close other tabs and applications before running the benchmark, and run it multiple times to get a representative average.

Question 3

Why is my browser score different from other benchmarks?

Accepted Answer

Different benchmarks weight different operations differently and use different baseline references. This tool uses simple, targeted tests rather than comprehensive suites like Speedometer or JetStream. Results here are best used for comparing the same browser across different devices or settings, rather than cross-browser comparison. Chrome V8, Firefox SpiderMonkey, and Safari JavaScriptCore all perform differently on different workloads.

Question 4

Does more RAM or CPU cores affect the score?

Accepted Answer

JavaScript is single-threaded, so the number of CPU cores has minimal impact on these tests — only one core is used. CPU clock speed and IPC (instructions per clock) are the primary factors. RAM capacity matters only if the system is under memory pressure; these tests use very little memory. CPU frequency boosts (turbo boost) significantly impact short benchmark runs.

Question 5

Which browser is fastest for JavaScript?

Accepted Answer

Modern browsers are competitive in JavaScript performance. Chrome V8 and Edge Chakra generally lead in raw numeric workloads. Firefox SpiderMonkey is competitive and sometimes faster on certain patterns. Safari JavaScriptCore performs excellently on Apple Silicon hardware. The differences are small in practice — typically within 20% for most workloads — and browser choice should be based on features and ecosystem, not micro-benchmark scores.

Browser Benchmark

How Browser Benchmarks Work

Score Guide

Related Hardware Tests

CPU Benchmark

FPS Test

GPU Stress Test

RAM Checker

Network Latency Test