That was my thought too, although my connection speed is high. Not long ago we had a 5mbps wifi package, but it would not always run Netflix, which requires 3mps for best results. I downloaded a speed test app and that showed an actual connection speed of 2.5 when things were working and 1 or 1.2 when Netflix would drop out.
I checked with the provider and they informed me that the 5 MPs connection doesn't actually run at that speed anywhere, however it is possible that it might some day, if only for a millisecond!
They sold me a shiny new data type service that does run at 21 to 25mbps on test. That is quite fast I think, although it's all Welsh to me!
Glen