: Choose a hosted image or file with a known size (e.g., a 5MB image).
: This returns a high-resolution timestamp in milliseconds, accurate to five-thousandths of a millisecond. javascript javascript detect speed
: 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. : Choose a hosted image or file with a known size (e