What do these numbers mean? Explanation?
I'm not sure what needs further explanation, but I'll try.
The
Load Time is how long it takes for the page to fully load.
Page Size is, well the file size of the entire homepage. 18MB is obnoxiously large for a text-content-heavy site.
Requests are how many times the page pings the server for some piece of information (code, etc.)
Ads are how many visible ads are on the page. This can include items like the price lists, etc. that don't appear to be an ad, but they actually are in a way - because they're not primary content.
Trackers are how many different cookies and other tracker code are tracking what you click on, where you came from, where to go when you leave, etc.
Social Annoyances are how many social media share buttons and other social media-related bits of code are found on the page. These also contribute to the Tracker count.
In summary:
MacRumors has a ridiculous amount of ads, trackers, and javascript code to support them that makes the page size huge, thus making it take a long time to load. The speed is also reduced due to the javascript code for the ads to load from the advertiser server (which is out of MacRumor's control, beyond just getting rid of the rogue ad).
If you run a decent AdBlocker type of extension in Safari and block all forms of ads, MacRumors loads almost instantly.