Avoiding web performance regression
By Marcel Duran (@marcelduran)
Works on the #web-core team at twitter.
Check out #flight
Problem: After a new release, apps get slower sometimes…
Monitoring is a reactive solution to solve performance issues.
Tools used: http archive (har) for yslow, yslow, cuzillion, fiddler, showslow
Har’s can be generated by- fiddler, phantomjs, yslow,
Install yslow locally (needs nodejs)
Ci and cd at yahoo
Crazy amounts of tests but no performance tests…
Phantomjs is a simple repeatable way to test web page performance times amongst other things.
Make performance tests a part of your ci process….
Next up: instead of just having perf tests in your ci process, graduate to a new level by measuring custom metrics on each performance run…
Peregrine is a tool used in twitter based on webpagetest
Peregrine takes code and deploys to performance boxes and integrates with webpagetest to run perf tests.
Peregrin will likely be open sourced soon..
the agile admin 