In Brief
DNS prefetching is a way for browsers to anticipate the DNS resolution of external domains from your site. This reduces the latency of some external files.As an FYI, I tried this with gclid and it’s definitely in the right ball park. One thing I have noticed is that for me a gclid URL will not […]

DNS prefetching is a way for browsers to anticipate the DNS resolution of external domains from your site. This reduces the latency of some external files.As an FYI, I tried this with gclid and it’s definitely in the right ball park. One thing I have noticed is that for me a gclid URL will not populate the W3TC cache, only a “naked” URL will populate the cache.