According to this post on the EasyList forum, confirmed by us, the following custom filter blocks the ads on this site. (The legacy site, Speedtest.net, uses Adobe Flash and is being phased out in favor of the newer site.)
Updated October 4, 2017, with new filters
- Click the AdBlock button and select Options, then click the CUSTOMIZE tab.
- Click Edit to open the custom filters box.
- Paste the filter below exactly as given.
- Click Save.
- Reload the page you're trying to view.