I couldn’t find this data (if it’s out there, please point me to it), so I went back to 1987 and pulled goaltender performance vs games rest. We knew goalies did poorly in the second game of a back-to-back pair, but I’m surprised to see such a large gap for two and three games. (The overall dataset is roughly 40000 games.)

Days between Games % of Games Mins (G1) Mins (G2) Shots Vs (G1) Shots Vs (G2) Sv% (G1) Sv% (G2) W% (G1) W% (G2) 1 9.5 54.7 55.0 28.9 29.7 0.905 0.897 0.498 0.421 2 35.6 57.0 56.8 28.7 28.7 0.908 0.901 0.522 0.486 3 19.2 57.1 56.7 29.0 29.0 0.905 0.900 0.514 0.481 4 12.1 56.7 56.3 29.2 28.7 0.899 0.898 0.477 0.487 5 7.2 55.4 55.2 29.0 28.8 0.892 0.899 0.440 0.448

There are lots of systematic issues here (e.g. most back-to-back games are on the road) but simplistically, this would mean goalie rest obscures the bulk of a goaltender’s value. That seems implausible and worth looking at in more detail…