Performance/Snappy/2012-09-20

Snappy Sep 20, 2012 Minutes

Actions

• Gavin will write down Q3 frontend goal
• Should follow regression on release, see if it's still there to rule out code causes vs environment causes
  • Make a list of big changes in ff15
    • bug 790213 should measure throbbing as a better proxy
  • Flash telemetry landed on july 4, should see if flash version correlates with pageload speed http://hg.mozilla.org/mozilla-central/rev/936ee90e6e54 (bsmedberg)
• Taras to outreach with Twitter on bug 784920, twitter is causing sync layout which harm the browser when the tab is in the background
• wlach will revew webpagetest.com and compare to eideticker for desktop

Incoming

• How should we fix image decoding? OMT? Delayed loading?
• CSS animation start jank - ping david baron (bug 753139)
• bug 792527 - bas to add Telemetry

Projects

Tab switch performance - jrmuizel

Results from the past week

Landed

• bug 788794 - Speed up final layers paint by 25x without hardware accelerated on Aero glass
• bug 791305 - Speed up color conversion from YUV to RGB of uncolor corrected images using NEON & SSE2

Not landed

• bug 781588 - Some work has happened but seems to have paused

- lmandel to follow up on this bug

Todo this week

• bug 792199 - Only decode visible images immediately when switching to a tab - more immediately useful than bug 689623

Profiler - jrmuizel/BenWa/Ehsan (and more)

Results from the past week

• Glandium/past have landed several to support the profiling protocol. A few more issues outstanding being tracked in bug 792855
• Getting interesting results back from eideticker profiling. Found 2 startup problems accounting for 0.5 seconds on a new profile (bug 789185, bug 789193) and variable imgur reflow time (bug 791744)

Todo this week

• Fixing a hang while profiling Fennec and openning the tab strip
• Working on syncing frames with profiles with wlach.

Tools and Automation: Eideticker, talos, peptest - mcote, ahal, wlach

Todo this week

• Goals w.r.t automation in Q4
• For Peptest: tab switching, cc over a specific amount of time
• webpagetest.com vs Eideticker for desktop