I would normally expect some kind of qualifier or additional info from the context to help me make a judgement - e.g. 'I haven't perused it at length', but I think in common parlance, one has the understanding of it being a good look through but not studying at depth. The other point that occurred to me is that it depends on who said it - it's not a word commonly used amongst my social group, so if said, it'd probably have a slightly ironic quality, but I have one or two senior work colleagues who may say it, and I would assume the dictionary definition if they said it.

I would assume they skimmed over it if that was said to me. I wouldn't assume they did it quickly, though. I'd only be assuming it was read in less time compared to someone who read it in detail.