: This returns a high-resolution timestamp in milliseconds, accurate to five-thousandths of a millisecond. javascript
: Choose a hosted image or file with a known size (e.g., a 5MB image).
: Speed is calculated as Distance (File Size) / Time . To avoid cached results, a "cache-buster" (a random query parameter) is added to the URL. Implementation Steps :
If you want to measure how fast your own JavaScript functions run, use the Performance API rather than the standard Date object.
: Use performance.now() for sub-millisecond precision. Fetch the Resource : Use the Fetch API to download the file. End the Timer : Record the time immediately upon completion.
:The navigator.connection object provides a rough estimate of the connection type (e.g., '4g') and effective bandwidth. However, it is often inaccurate for precise speed tests and has limited browser support. 2. Detecting Code Execution Speed (Benchmarking)