BBC News Performance Review
Higher load times correlate to higher bounce rates
Why are we so slow?
Blocking scripts in <head>
Adverts block loading & rendering
Many requests go to origin
~330ms RTT for Asia/Pacific regions
1MB of CSS
All the images
So let's fix it
Fig.js can be improved
(document complete time is skewed due to lack of ads)
Ads can be loaded asynchronously
Improved CDN infrastructure reduces origin requests
CSS can be optimised
like, really optimised
Original: 990KB
Optimised: 45KB
Keeping on top of performance
Automated monitoring & alerts
Better practices moving forward
