Article: how to write a fast site using Polymer

[jyasskin]

Polymer/polymer#426 sped up polymer-project.org significantly by doing page transitions over ajax and making a couple other changes. It would be good to write an article explaining what client- and server-side changes another project would need to make to get the same improvement.

[ebidel]

Good idea! I'll start dumping ideas here.

• discussion of polyfill vs. native
• vulcanize all the things (--csp --strip is very important for polyfill and parser context switching)
• ajaxified site so common imports were loaded once once. Once in page, swap things out.
  • need better import de-duping for full modularization of imports
• body[unresolved] is useful for starters, but complex apps need to control FOUC themselves
  • we had to replicate some css in our main stylesheet so the elements would do less layout when they're upgraded.
• use one time bindings...?
• stay away from attribute selectors. they're generally slow
• pretty printing code client-side is handy, but it comes with a cost.

[robdodson]

I think this is related to: #339. Closing in favor of #339, feel free to reopen if you disagree.