  QUIC, as the foundation for HTTP/3, is becoming an Internet reality. A
plethora of studies already show that QUIC excels beyond TCP+TLS+HTTP/2. Yet,
these studies compare a highly optimized QUIC Web stack against an unoptimized
TCP-based stack. In this paper, we bring TCP up to speed to perform an
eye-level comparison. Instead of relying on technical metrics, we perform two
extensive user studies to investigate QUIC's impact on the quality of
experience. First, we investigate if users can distinguish two protocol
versions in a direct comparison, and we find that QUIC is indeed rated faster
than TCP and even a tuned TCP. Yet, our second study shows that this perceived
performance increase does mostly not matter to the users, and they rate QUIC
and TCP indistinguishable.
