4 ms·

I never understood that, why would moving assets to another domain name speed things up? Wouldn't it involve another DNS lookup, thus adding to download time?

I never understood that, why would moving assets to another domain name speed things up? Wouldn't it involve another DNS lookup, thus adding to download time? edit: I remember reading about this on Yahoo's speed guide, actually: http://developer.yahoo.com/performance/rules.html#cookie_free http://developer.yahoo.com/performance/rules.html#cookie_fre... Still don't quite get it though. Cookie data is always passed in HTTP requests for some reason?

jmileham 15y ago
Yeah, there's an initial hit, but only one DNS lookup per session-or-so if you've got your TTLs right. You're likely to hit hundreds (if not thousands) of assets in a typical Facebook session, though. Edit: Actually, in Facebook's case, Akamai has a 20 second TTL. But it's not difficult to perform ~1k asset requests in that amount of time... just scroll through a large friend list.