Sophos enterprise console stopped updating
Most users get a similar result to their "favourite" speed test or the ISP "recommended" speed test.
If you repeatably get a lower result look more carefully at your browser and your PC. Install a clean, current, browser (Firefox or Chrome) and try it with that before concluding anything.
Unless you have 500 megabit to 1gigabit , you should be able to ignore ping time and still test your line to maximum speed. This is a browser based speed test, and needs some temporary memory to store the incoming data before it can free it.Since the test does use some graphics, those may also be a source of excessive CPU usage in cases where the browser is not well suited to the OS..