Enyo 2.3.0-rc.24 to 2.5.0 Performance Notes

Enyo 2.5.0 includes numerous changes designed to improve performance, including (but not limited to) the following:

Observers and bindings have been reworked to use smaller, more efficient code, improving execution time (while also adding new functionality).
In moon.Panels, the pushPanels() method no longer forces all panels to be resized, which greatly improves performance when working with a large number of panels.
Fittable layout kinds have been rewritten to take advantage of the CSS3 flex-box properties on platforms that support them (including webOS). This reduces the number of layout operations that the browser must perform.
Spotlight focus highlighting is now "muted" during panel transitions; this reduces the likelihood that paint operations will occur during a transition, thereby improving the transition frame rate.
The onTransitionFinish event was firing too early, causing poor performance during panel transitions when tasks were tied to the event. This behavior has now been corrected.
Marquees no longer unintentionally promote all younger siblings to a new composition layer, forcing slow re-layouts on start and stop.
Implemented new technique for moon.Panel collapse/expand transition, improving frame rate.
The moon.Panels show/hide transition animation (triggered by the edge handle) has been improved, resulting in better frame rate.
Implemented new technique to improve moon.ListActions animation, resulting in improved frame rate; also fixed a number of animation-related bugs.
Redesigned state-change for moon.ToggleItem to include transition animation, while also refactoring to use CSS instead of costly image assets.
Rewrote moon.Spinner, using DOM, transforms, and keyframe animations to ensure that the spinner doesn't stop, even when the main CPU thread is busy.
Provided a way to perform hardware-accelerated sprite animations.