I just tried it twice, once on a public wi-fi network. And then again when I got home. It worked very well on the public wifi, and had many false positives at h

I just tried it twice, once on a public wi-fi network. And then again when I got home. It worked very well on the public wifi, and had many false positives at home. It seems to work better on slower internet connections. The script returns calls a site "visited" if the response time of the potentially cached image is less than 1/20 the time of the certainly uncached image. On slow connections the cache is much faster than the uncached. On fast connections it's only slightly faster. However, the known uncached images sometimes have "10x increase in latency" so it seems that based on my (and other's experience) that this is a major problem. One could attempt to normalize this for the sites where appending random query string causes higher latency. Simply precalculate the added latency from images with the random query string on a per site basis. Then subtract it from "uncachedTime."