Firefox/Projects/Perception of Performance: Difference between revisions

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= Overview =
= Overview =
'''Sprint lead:''' faaborg <br/>
'''Sprint lead:''' faaborg <br>
'''Sprinters:''' faaborg, margaret
'''Sprinters:''' faaborg, margaret  


= Goals / Use Cases =
= Goals / Use Cases =


* Identify top 5 ways to improve perceived performance
Note: the previous work in this sprint on building an acceleration based scrolling model has been spun off into a separate project: [[Firefox/Projects/AcceleratedScrolling|Accelerated Scrolling]]
** [https://wiki.mozilla.org/Perceived_Performance Full list of brainstormed ideas] I need to organize this list, grouping items into categories, and identifying the top 5 items.
* Resolve one on trunk (we selected acceleration model for scrolling)


= Non Goals =
*Identify top 5 ways to improve perceived performance
**[https://wiki.mozilla.org/Perceived_Performance Full list of brainstormed ideas] I need to organize this list, grouping items into categories, and identifying the top 5 items.
*Resolve one on trunk (we selected acceleration model for scrolling)


* Actually improve real performance :)


= Current Progress=


* Margaret has an initial implementation of an acceleration-based scroll model working on Windows
= Top 5 Perception of Performance Improvements =
* The two thresholds we are now interested in experimenting with and tweaking are the:
** rate of acceleration
** time chunk of events to analyze before processing them
* Still looking for research and documentation in this general area of UI toolkit design
* Two patches are up for review that add the functionality described below


= Design: Acceleration Model for Scrolling =
#[[Firefox/Projects/AcceleratedScrolling|Accelerated Scrolling Model]] (now covered in a separate project: [[Firefox/Projects/AcceleratedScrolling|Accelerated Scrolling]])
#[[Firefox/Projects/Per_Tab_Network_Prioritization|Per Tab network Prioritization]]
#[[Firefox/Projects/Animation_priorities|Animation]]
#[[Firefox/Projects/Eradicate_Startup_Dialogs|Seamless updates]] (specifically {{bug|307181}} and {{bug|511529}})
#Accelerated model for scroll bar progress {{bug|513826}}


We're using a timeout function to group mousewheel clicks into separate series, where each series represents a unique scroll gesture. Within each series we increment a counter that keeps track of the number of clicks of the scroll wheel within the series, and we can use this value to determine when to start acceleration and how much acceleration to create.
= Related Links  =
 
*[[Perceived_Performance|Brainstorming Wiki page]]
We're using three integer preferences to modify scroll wheel behavior:
*[http://margaret.mit.edu/2009/08/making-firefox-feel-faster/ Making Firefox Feel Faster]
* '''mousewheel.withnokey.numlines''' (default=6)
*[http://blog.mozilla.com/faaborg/2009/08/05/sure-its-fast-but-how-does-it-handle/ Sure it’s Fast, But How Does it Handle?]<br>
** The number of lines the page moves with one click of the scroll wheel.
*[http://blog.mozilla.com/faaborg/2009/08/07/whats-next-for-the-perception-of-performance/ What’s Next for the Perception of Performance?]<br>
** This pref is used to determine a scroll delta before acceleration computations are applied.
* '''mousewheel.acceleration.start''' (default=3)
** The scroll wheel click number at which acceleration begins to take effect.
* '''mousewheel.acceleration.factor''' (default=10)
** The multiplicative factor used to scale constant acceleration.
 
= Bugs =
*{{bug|462809}} - Interpretation of scroll events on Windows and OS X
** '''review+ (vlad)'''

Latest revision as of 00:50, 1 September 2009

Overview

Sprint lead: faaborg
Sprinters: faaborg, margaret

Goals / Use Cases

Note: the previous work in this sprint on building an acceleration based scrolling model has been spun off into a separate project: Accelerated Scrolling

  • Identify top 5 ways to improve perceived performance
  • Resolve one on trunk (we selected acceleration model for scrolling)


Top 5 Perception of Performance Improvements

  1. Accelerated Scrolling Model (now covered in a separate project: Accelerated Scrolling)
  2. Per Tab network Prioritization
  3. Animation
  4. Seamless updates (specifically bug 307181 and bug 511529)
  5. Accelerated model for scroll bar progress bug 513826

Related Links

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