A network diagnostic and performance measurement tool developed at the Energy Sciences Network (ESnet) is being used by Comcast to fine-tune the largest residential Internet network in the United States and help ensure its services remain up and running at top speed during the COVID-19 crisis. https://www.es.net/news-and-publications/esnet-news/2020/esnets-iperf3-helps-comcast-meet-customer-demand-during-covid-isp-surge/?ct=t(EMAIL_CAMPAIGN_2020421_ITL)