If you do a speed report on Plone.org you notice that the three biggest files it services are
. If you run these through my little slimmer whitespace optimizing program in Python you get the following results:
Using an on-the-fly whitespace optimizer isn't always the right thing to do but in the case of this particular site you prevent serving: 26Kb in 0.1 seconds (on this computer).
26Kb isn't a lot by looking at their traffic summary you see that they could serve 3.3Gb less per month (before gzip compression). That's a big save.