While "Internet Speed Test 3.3" does not appear to be a major standalone software title, your query most likely refers to either a specific or a speed test result showing 3.3 Mbps.
Ensure no other devices are streaming, gaming, or downloading updates while you run the test [2]. Internet Speed Test 3.3
Run tests during "off-hours" and "peak hours" (evenings) to see if network congestion is an issue [4]. While "Internet Speed Test 3