NoScript doesn't do general-purpose blocking of resources from third-party domains- it only handles blocking scripts and objects like Flash. So if a site won't load when NoScript is active, it's because the site is not delivering any viewable content through the initial request, just scripts which then go on to request the actual content. Such sites are obviously not optimizing for latency, and are also accessibility nightmares.
As for the cookie concerns: first-time visitors don't have any cookies to be sending. Regular users have a cached copy of your stylesheet. Someone who hasn't been to your site in months probably won't have a cached stylesheet, and if you're worried about the performance impact of cookies for them, then just consider whether that cost is worth paying for whatever benefit you're getting by setting long-lived cookies for users who didn't come back soon after their previous visit.
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NoScript doesn't do general-purpose blocking of resources from third-party domains- it only handles blocking scripts and objects like Flash. So if a site won't load when NoScript is active, it's because the site is not delivering any viewable content through the initial request, just scripts which then go on to request the actual content. Such sites are obviously not optimizing for latency, and are also accessibility nightmares.
As for the cookie concerns: first-time visitors don't have any cookies to be sending. Regular users have a cached copy of your stylesheet. Someone who hasn't been to your site in months probably won't have a cached stylesheet, and if you're worried about the performance impact of cookies for them, then just consider whether that cost is worth paying for whatever benefit you're getting by setting long-lived cookies for users who didn't come back soon after their previous visit.