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+1
Agreed.
This is already on the list of bug-reports/feature-requests you should vote on; see this meta.SE post.
I think voting for a comment and actually commenting both count towards the 30 second cutoff. This wasn't immediately obvious to me form the StackExchange message, but it did end up explaining a lot of the "spurious" complaints.
"You may only fetch comments every 2 seconds."
Most irritatingly, when I get this message, the link to fetch comments disappears, but the relevant comments do not appear, so I cannot even try again in 2 seconds without reloading the page.
Yeah. That pretty much defeats what I imagine is the point, lowering the load on the server, for a reload of the page surely implies more work than the ajax-y request for the comments!
Yeah, I just got this for the first time recently, and it was indeed annoying. I've put a request on meta.stackexchange, please vote for it!
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