[EugeneOZ]

ios, Safari, wifi (59 mbps on fast.com):

http/2 is 10 times faster on first load, 2-3 times on subsequent.

[codefined]

Windows, Firefox, Ethernet (220mbps on fast.com):

https/2 is ~0.1s (1.02s /2 vs 1.11s /1.1) faster on first load and ~0.2s faster on future loads. I'm tempted to say there are diminishing returns as your internet gets faster (latency is ~11ms atm).