OpenSignal report and Korea's lead in network speed

As readers of this blog will know, the speed of digital data processing and transmission was one of my recurrent concerns in earlier posts (see these for example).  A new (February 2019) report by OpenSignal confirms that Korea's 4G mobile networks are still the world's fastest.   The report makes interesting reading.  One of its main findings is that 4G speeds around the world "...vary tremendously across the day, showing the impact of congestion on daytime speeds."   (click on the graphic for a full size version)

The OpenSignal report indicated that Korea ranked number one in the world in average download speed, but it broke this down into 4G speed at the slowest hour of the day compared with speed at the fastest hour of the day.  Part of the graphic is shown at left.  Currently, 4G users around the world experience a wide range of download speeds between the slowest and fastest hours of the day.  Furthermore, cities see the greatest speed swings, indicating daytime congestion that might be relieved by 5G.  As noted in the report, "Users in Paris experienced the greatest range of 4G Download Speeds, fluctuating between 21.5 Mbps and 51.4 Mbps in a 24-hour period, followed by Sydney and Santiago. Worryingly, New York's fastest hour for 4G speed of 40.8 Mbps was in a virtual dead heat with the 40.6 Mbps Seoul’s inhabitants experience at their slowest hour of the day. But Seoul’s slowest hour of day is still faster than the fastest hour of day in Taipei (38.2 Mbps), London (38.3 Mbps) and 21 other cities analyzed." (My emphasis added in the quote)