Mierzy te wyniki of JavaScript code is essential for optimizing web applications. This article provides a clear, step approvach to calculating performance metrics using JavaScript.

Understanding Performance Metrics

Wydajność metrics help developers identify nearchecks and improwizuj thee efficiency of their ir code. Common metrics included e execution time, memory usage, and frame rate.

Using the Performance API

Te programy API zapewniają narzędzia do pomiaru warianus aspects of code execution. The enformance 1; The enforcement 1; FLT: 0 enforce.3; Supporte.now () enforce.1; FLT: 1 enforced 3; Supported returns a high-resolution timestamp, ideal for precise timing.

Tu miara execution time, timestamps before and after thee code block:

Xi1; Xi1; FLT: 0 Xi3; Xi3; Example: Xi1; Xi1; FLT: 1 Xi3; Xi3;

const startTime = performance.now ();

/ / Code to measure

const endTime = performance.now ();

conct duration = endTime - startTime;

Obliczanie Other Metrics

Memory usage can be checked using the include 1; Xi1; FLT: 0 content 3; Xi3; performance.memory indiv.1; FLT: 1 content 3; Xion3; object, which provides details like total JS heap size and used heap size. Note that this API is supported mainly in Chrome.

For frame rate measurement, use the indis1; Xi1; FLT: 0 Xi3; Xion3; requestAnimationFrame Xion1; Xion1; FLT: 1 Xion3; Xion3; functionon tok rendering performance over time.

Begt Practices

Zawsze perforacja miara mnożnik czas to rozliczenie for variability. Usie averages to get more procitate results. Avoid miaring during period of high activity that can skew data.

  • Use high-resolution timers like preci1; EDI1; FLT: 0 EDI3; EDI3; performance.now () EDI1; EDI1; FLT: 1 EDI3; EDI3;.
  • Nieporządne miary mnożą się razy for celliacy.
  • Porównaj wyniki niedostatku warunków.
  • Monitoror memory usage with 1; Xi1; FLT: 0 Xi3; Xi3; performance.memory Xi1; Xi1; FLT: 1 Xi3; Xi3;.
  • Track rendering performance with 1; Xi1; FLT: 0 Xi3; Xi3; requestAnimationFrame Xi1; Xi1; FLT: 1 Xi3; Xi3;.