732323 - SVG declarative animations performance tracking bug

Status: NEW

(Core :: SVG, defect)

Description

[Brian Birtles (:birtles)]

There's a lot of things we could do to make declarative SVG Animation faster but we haven't until now because we were unsure of the future of this technology.

That seems to be changing so I'm filing a tracking bug for this. Some initial ideas of areas to tackle:

* use hardware acceleration for simple animations
* detect if we have event listeners for animation events and skip the event dispatch path if there are none--also skip "repeat" milestones
* don't reallocate the compositors on every sample (or allocate them out of a memory pool)
* change to low-res rendering whilst animating (WebKit seems to do this for CSS animations)
* be more aggressive about detecting when a style might have changed rather than just assuming it must have for certain types (see bug 562815. For example, we always recompose animations on the display property due to issues with <use>, bug 536660, this should be fixed)

Comment 2

[Robert Longson [:longsonr]]

bug 1903214 detects if we have event listeners and skips event dispatch.