Let’s talk about latency.
Latency is an important element in online gaming. Whilst most ISPs (Internet Service Providers) advertise their speeds (normally as an average), they rarely talk about their latency.
For "realtime" gaming, your internet connection needs to have a low latency to avoid lag (the delay between player input and game response). High latency can also cause poor frame rate and bring the game grinding to a halt. For competitive online games such as Call of Duty & FIFA, a slow response time can be detrimental to the enjoyment of the game.
But whilst an advertised high speed would indicate a great low latency speed, this is not always the case. Traditional copper lines on oversubscribed networks come with a greater overhead of higher latency. They are, at best, 2/3s slower than fibre connections.