The report published by UK broadband comparison site cable.co.uk — which analysed data from the Oxford Coronavirus Government Response Tracker — found that Australia and New Zealand experienced a combined average drop in measured Internet speeds of -12.05% - but this was due to New Zealand alone.

In fact the report reveals that New Zealand experienced a drop of -17.88% compared to Australia’s small rise of +5.38% during its lockdown period.

The global report covered over 364 million broadband speed tests provided by M-Lab led by a teams based at Code for Science & Society, New America’s Open Technology Institute, Google and Princeton University’s PlanetLab - to compare average Internet speeds in the 114 countries during and outside of their most stringent COVID-19 lockdown periods.

In the 114 countries that instituted lockdowns, speeds dropped by an average of -6.31%, with China leading the way — both globally and in the Asian region — with the biggest plunge in speeds.

In Asia (excluding Near East), Internet speeds dropped by -16.33% on average for the region - with 12 of the 19 qualifying countries experiencing slower Internet speeds during their lockdown periods, with China (-50.97%) showing the largest drop.

Including China, the other four countries whose average Internet speeds dropped the most during their lockdown periods were Panama (-48.99%), Madagascar (-37.71%), Chile (-36.77%) and Peru (-36.76%).

Using OxCGRT's stringency index, which tracks government lockdown measures that specifically limit the behaviour of populations, analysts at Cable.co.uk measured, per country, speeds both during and outside of the most stringent lockdown measures falling between 1 January and 30 June.

According to the report, the region where speeds dropped by the greatest percentage overall was Central America, with an average drop of -26.03% during its combined lockdown periods.

And only one of the six countries qualifying in the South American region experienced a rise, with Costa Rica at +0.82% – while Panama (-48.99%), Guatemala (-14.30%), Honduras (-3.69%), Mexico (-2.35%), and El Salvador (-0.01%) all experienced drops in speed of varying severity.

Northern Africa recorded the second-highest overall drop in Internet speeds during lockdown periods, with all five qualifying countries in minus figures.

Libya (-27.38%) recorded the largest drop, followed by Tunisia (-23.23%), Morocco (-18.72%), and Algeria (-13.76%), while Egypt's Internet speeds experienced the smallest drop at -5.96%.

South Korea (-30.45%), Malaysia (-29.51%), Sri Lanka (-23.29%), Bangladesh (-21.76%), India (-21.05%), and Nepal (-20.77%) also experienced significantly slower speeds during their lockdowns. Afghanistan (+23.95%), and Vietnam (+12.84%), bucked the trend in this region, showing statistically significant increases in speed during their lockdowns.

South America showed an average drop in internet speeds of -16.11%, with seven out of the 11 qualifying countries measuring drops in speed during their lockdown periods.

Chile (-36.77%), Peru (-36.76%), Paraguay (-29.91%) and Bolivia (-21.45%) experienced the “most precipitous” drops in measured speeds, the report reveals, but conversely, small increases in speed were measured in Guyana (+8.51%), Brazil (+3.55%), and Uruguay (+2.37%) during their lockdown periods.

In sub-Saharan Africa, 13 of the 14 qualifying countries recorded drops in measured internet speeds during their lockdown periods, with an average decrease of -14.24%.

Angola bucked the trend in the region, showing a surprising increase of +117.19% during its lockdown period. Meanwhile, Madagascar (-37.71%), Cote d'Ivoire (-30.77%), Ghana (-24.58%), and Nigeria (-20.84%) experienced the largest drops in measured speeds during their respective lockdowns.

CIS (former USSR) countries experienced an average drop in measured speeds during lockdown periods of -6.12%, a number very close to the global average. Four out of six qualifying countries in the region were measured to have experienced drops in internet speeds. Kyrgyzstan (-36.48%) and Russia (-12.60%) were measured to have the most pronounced drop in internet speeds during their lockdowns. Meanwhile, Ukraine (+14.86%), and Uzbekistan (+7.55%) saw small rises.

Western Europe (-4.66% overall) shows an interesting picture, with 12 of its 15 qualifying countries exhibiting measured drops in internet speed during their lockdown periods.

However, Ireland (-2.23%), United Kingdom (-1.70%), Portugal (-0.19%), and Switzerland (+2.90%) all exhibit changes in speed that should be considered somewhat negligible. The countries showing the largest drops in average speed during their lockdown periods were Finland (-24.81%), Netherlands (-13.01%), Austria (-10.47%), and Italy (-10.44%).

Northern America – a region with only two qualifying countries – averaged a drop in lockdown internet speeds of -2.91%. Speeds in Canada fell by -10.82% during its stringent lockdown period. Meanwhile the United States actually saw a small rise in speeds during its lockdown period (+3.32%).

On average, the Near East region, comprising 14 qualifying countries, saw almost no change during its combined lockdown periods, with internet speeds down just -1.49% on average.

Six countries recorded drops in average speed, seven gains in speed both small and large, and one (Qatar) was one of only two countries in the study to show no change at all (0.00%). The countries which recorded the largest drop is speed were United Arab Emirates (-18.42%), Israel (-14.59%), Saudi Arabia (-12.62%), and Yemen (-11.69%).

Eastern Europe measured an average drop in measured internet speeds during lockdowns of just -1.17%. A majority of the countries in the region showed almost no change. However, Hungary saw a drop in speeds of -13.26%, while at the other end of the scale significant rises were measured during lockdown periods in Moldova (+25.54%), and Bosnia and Herzegovina (+45.33%).

The Baltics, comprising three qualifying countries, saw the closest to no change of any region in this study, with a positive change of just +0.41%. Lithuania (-8.87%), and Estonia (-5.97%) both saw small drops in speed during their lockdowns, while Latvia (+17.91%) saw instead a fairly pronounced rise.

The Caribbean appears to have "fared best overall as a region", though only four countries qualified for measurement. Dominican Republic (-26.52%) was the only country in the region to experience a drop in speed during its lockdown. Puerto Rico (+0.75%), Jamaica (+7.68%), and Trinidad and Tobago (+19.16%) all saw rises in speed during their lockdown periods.

Commenting on the findings, Dan Howdle, consumer telecoms analyst in charge of the study at cable.co.uk, said: “We set out to identify changes in network speeds in countries around the world which had instituted lockdown policies that put restrictions on populations that may cause more time to be spent at home, and thereby more time spent using the Internet.”

“Thanks to the Oxford COVID Government Response Tracker and its highly useful stringency index, we were able to pinpoint the precise period in each country where lockdowns were at their most life-limiting, and match them up with over 364 million (M-Lab) speed tests.

"The results are startling. Although an overall drop of just -6.31% across all countries doesn't sound like an awful lot, this figure moves very much against the tide.

“Our annual global broadband speed tracker has demonstrated global increases of around 20% year-on-year since 2017. For the majority of countries in this study to be moving in the opposite direction during their COVID-19 lockdowns, then, is all the more significant.

"While it is impossible to attribute direct causality, our study shows a high correlation between lockdown periods around the world and dips in measured internet speeds, with some regions of the world measuring the most substantial drops, and others more or less unchanged. The picture is an interesting one indeed, and I hope our work will be of interest to anyone who seeks to further understand the influence of stringent lockdown measures on network capacity and capability."