Question on hashrate dependencies.
(note: I searched the forum for previous posts and saw some info but figured it's been a while and perhaps things have changed)

How accurate are the reported hasrates, and how much of a lag is there in their data shown?

Regarding lag, ie how recent is the 1min and 5 min (how often is this refreshed or updated at the pool)?

And in terms of accuracy, how close should the ASIC end and pool end be, ie I'm normally +/- 1.5% (or less) in difference but at times there's a nearly 10% (or more) discrepancy. Recently I noticed this, had 9 ASICs pointing here and 1 was way off (for hours) at the pool, while on my end they all seemed to be the same.

Lastly, I know it's not crucial data (yes, all that matters is luck and hitting a block), but I'm just curious and since it has been quiet here lately thought it would be a good time to ask. Once again thanks in advance to all the folks who provide any constructive info on this, it's always appreciated! TY!