Most modern tests append random strings to the file request so your browser doesn't try to load a previous version from its memory, which would result in an artificially high speed. Why Use Temp Files for Testing?

The software records the transfer time and file size to calculate your speed in megabits per second (Mbps).

The server sends a small packet to your device and measures the time it takes for a response.

A is a method used to measure your internet connection's performance by downloading a non-essential file from a server to your local machine. Unlike standard streaming or web browsing, this test uses randomized "dummy" data to provide a precise benchmark of your real-world throughput without the interference of browser caching. How Temp File Speed Tests Work