The United States never ranks at the top of countries for mobile internet access speeds. It never ranks at the top for fixed network internet access either. The United States never ranked at the very top for voice service adoption, either. Some would say such rankings do not matter.
The whole point of having communications capabilities generally is to support social, economic and other goods that we believe come with good communications. Deficiencies such as “lack of coverage” or service quality (audio quality, internet access speed) are therefore problematic since those conditions might hinder desired social and economic outcomes.
The rankings, per se, do not matter much. What matters is the ability to wring value from such capabilities. And while there is a generalized correlation between mobile internet access speed and measures of economic strength, the correlations are not necessarily causal.
Whatever combination of factors “causes” economic well-being, it is impossible to say what percentage of economic health is produced by any single input element. Few would likely question the assertion that the U.S. economy is large and robust, despite never ranking at the top of measures of communications supply.
Nor, some might well argue, can ranking at the top of measures of internet access speed propel most economies much further than they can, based on all the other background factors (population size, for example).