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My google-fu must be too weak, as i can find mostly posts & threads saying opposite in this forum. At least for NA (which most are). I see just Mike, Dave-ROR, Robispec and so on claiming having better times with narrower for track/hpde. Though i guess it might be not just because of "less rolling resistance/weight/more power to accelerate", but that sometimes too wide might mean too hard to get enough heat in track tires for optimal temps (if NA power/non heavily modified, which are again, most), or less optimal slip angle, or worse gearing.
And then there are practical sidegains to running narrower except just performance points of weight/less sidewall flex/less rolling resistance/quicker to heat up, for example - cheaper cost, more space in car for other things if track set of 4 is in car, less suspect to aquaplane (if tires are dual-use), sometimes better availability of specific tire model, need to spend less on accompanying mods (eg. suspension/brakes/aero/power, to get more out of wide tires).
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