g.verhoeven, post #30: Picking up post #27: that is the part I would want checked first. Performance: if pages are slow to load, timeouts occur, or the site is unresponsive, that is worth reporting with details (when, which pages, how slow).
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post #52 is right about the mechanism and I think understates the practical bit.
I disagree with the reply above, and I think the disagreement is substantive rather than terminological.
The distinction being drawn does not survive when you look at the published data for this specific question. I would be glad to be shown wrong on this, because the version I am arguing against is more convenient.