“Takeaway: We observe that QUIC provides significant improvements over TLS/TCP in low-bandwidth and high-RTT regions for video downloads. QUIC handshakes towards YouTube media servers offer an improvement of 534 ms (IN) and 406 ms (DE) when compared with TLS/TCP. We also observe that the overall download rate for TLS/TCP is higher than QUIC partly due to kernel optimizations such as LRO available for the TCP stack. QUIC provides a better video streaming experience with a lesser number and duration of stall events compared to TLS/TCP. We observe that TLS/TCP exhibits up to 50% longer stall durations compared to QUIC at 50th percentile for high loss networks.“
https://vaibhavbajpai.com/documents/papers/proceedings/quic-...
Also the study discussed about the server-side CPU usage. If you are worried about server-side offloading, you can still stick to TCP/IP until the hardware acceleration and other offloading catches up.