Posted by: RC Master
Posted by: Achronos
It wouldn't be the cookies.
This. I mean, why would anyone even think it was? They're used on page load only afaik. Once you've loaded the page it wouldn't affect performance.They're not really supposed to be used like that, even though Bungie.net does it (look at your username in the top right for a good example) - I'd assume it's probably because pages are delivered from some cache which isn't processed by a script to inject usernames, etc... so Javascript does it instead (which is where you may see performance issues popping up). That's beside the point though.
It's a bit of a stretch to be able to completely rule it out as being a not being a cookie problem when: a) Javascript has the ability to read/write to/from cookies; b) Javascript can therefore use make use of or (god forbid) eval() a cookie value; and c) It [Javascript] can affect the browser UI in the same manner with the same results the OP describes.
That is particularly relevant when something like a compromised/corrupt cookie inadvertently gets written to the page unencoded (example above) and you find yourself on the unfortunate side of XSS, for example.