  To keep up with increasing demands on quality of experience, assessing and
understanding the performance of network connections is crucial for web service
providers. While different measures, like TCP options, alternative transport
layer protocols like QUIC, or the hosting of services in CDNs, are expected to
improve connection performance, no studies are quantifying such impacts on
connections on the Internet.
  This paper introduces an active Internet measurement approach to assess the
impacts of mentioned measures on connection performance. We conduct downloads
from public web servers considering different vantage points, extract
performance indicators like throughput, RTT, and retransmission rate, and
survey speed-ups due to TCP option usage. Further, we compare the performance
of QUIC-based downloads to TCP-based downloads considering different option
configurations.
  Next to significant throughput improvements due to TCP option usage, in
particular TCP window scaling, and QUIC, our study shows significantly
increased performance for connections to domains hosted by different giant
CDNs.
