https://www.bleepingcomputer.com/news/microsoft/microsoft-edge-tests-fix-for-dns-over-https-performance-issues/

Microsoft is testing a fix for performance issues in Microsoft Edge’s DNS-over-HTTPS feature and has once again enabled a list of suggested DoH servers.

DNS-over-HTTPS (DoH) allows DNS resolution to be performed over an encrypted HTTPS connection rather than through normal plain text DNS lookups.