Brian Rinaldi is a Developer Experience Engineer at LaunchDarkly with over 20 years experience as a developer for the web. Brian is active in the community running CFE.dev and Orlando Devs.
In answer to 1. No idea, since it falls back on XHR anyway. I had the same question myself.
As for 2, the page is a bit too simple that even with network throttling, it loads fast - as in, there seemed to be a difference between the preloaded and non-preloaded times but it was minor enough that I could have been imagining it...and since we are talking about perceptions here, it's hard to say definitively.
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In answer to 1. No idea, since it falls back on XHR anyway. I had the same question myself.
As for 2, the page is a bit too simple that even with network throttling, it loads fast - as in, there seemed to be a difference between the preloaded and non-preloaded times but it was minor enough that I could have been imagining it...and since we are talking about perceptions here, it's hard to say definitively.