[jacquesm]

I've gone down this same optimization route for some of my sites and disabling trackers was one of the biggest contributors. If you have to have trackers consider loading them only on a small percentage of your users to get you a statistically relevant sample. This will at least give the bulk of your users a vastly better experience. You'll need to scale the percentage of users you do put the trackers on with your traffic.

[boreas]

That's an interesting idea. Seems like it would be hard to get a representative sample though if the trackers themselves affect the user experience.