>The results show that QUIC and HTTP/2 exhibit similar performance when the network bandwidth is relatively low (below ∼600 Mbps)

>Next, we investigate more realistic scenarios by conducting the same file download experiments on major browsers: Chrome, Edge, Firefox, and Opera. We observe that the performance gap is even larger than that in the cURL and quic_client experiments: on Chrome, QUIC begins to fall behind when the bandwidth exceeds ∼500 Mbps.

Okay, well, this isn't going to be a problem over the general Internet, it's more of a problem in local networks.

For people that have high-speed connections, how often are you getting >500Mbps from a single source?