Failed to load resource: net::ERR_CACHE_MISS
Nothing related to Craft at all, but a Chrome bug.  Has been fixed in v40 in the dev channel and will eventually make it into stable.

https://stackoverflow.com/questions/26408931/bizarre-error-in-chrome-developer-console-failed-to-load-resource-neterr-ca

But I agree, it's a really annoying bug.