If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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Do we have any evidence about the severity of that information lag? I can't imagine it would be much more than a year. I don't know if this is a legitimatize concern. It may very well be worth a little waste value from info-lag for the benefit of overall efficiency.
Are we talking about lag within the community of people who read Givewell regularly, or in the broader community? Because that might be right for the former, but the latter has a lag that I expect to be measured in at least decades. Possibly centuries, given how much money still goes to churches.