The document discusses improving page load performance on websites. It notes that many sites are currently too slow and outlines some strategies to minimize latency, round trips, and blocking of page loads. These include prioritizing important content in the first round trip, automating optimization processes, and measuring performance directly in the user's browser to better understand why pages are slow and how to fix those issues. The document emphasizes that performance is an important part of user experience that needs more consideration in website design.

1. Page Load Performance
#EdgeConf 3, Mar 2014

2. http://www.flickr.com/photos/sybrenstuvel/2468506922
I’m frustrated…

3. The web is too slow
http://www.flickr.com/photos/the_justified_sinner/3507390621

4. The web is too slow
http://www.flickr.com/photos/the_justified_sinner/3507390621

5. Too may sites are too slow
http://www.flickr.com/photos/the_justified_sinner/3507390621

6. - Minimise Latency!
!
- Minimise Round Trips!
!
- Minimise Blocking
We know how to make sites fast!

7. Maximise value from first round trip
Guardian divide page load into!
!
- Content!
!
- Enhancements!
!
- Leftovers

8. Browsers are doing a great job
http://www.flickr.com/photos/brianauer/2197218356/

9. HTTP/2

10. But we keep adding more and more to our pages
http://www.flickr.com/photos/70601645@N00/383984327

11. and including more render blocking requests
http://www.flickr.com/photos/timo/3995227

12. We can automate optimisation
http://www.flickr.com/photos/freshwater2006/693945631

13. We’ve got some great tools

14. We can measure in the visitor’s browser
- Page level timings!
!
- Resource level timings!
!
- User defined timing points

15. We need to move beyond ‘which pages are slow?’

16. To why are they slow?

17. To how do we fix them?

18. Performance is a facet of User Experience
http://www.flickr.com/photos/21218849@N03/8638895168

19. We need to design for it
http://www.flickr.com/photos/9760699@N08/3748770917

20. http://www.flickr.com/photos/communityfriend/2342578485
It’s just another constraint

21. We’ve come a long way…
http://www.flickr.com/photos/proimos/5452083285
…but we’ve still a way to go