🚀 [Story performance] Disable animations in first page under experiment #35356
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Hey @gmajoulet, @newmuis! These files were changed: |
gmajoulet
reviewed
Jul 22, 2021
mszylkowski
changed the title
gmajoulet
reviewed
Jul 22, 2021
| @@ -465,6 +465,11 @@ export class AmpStory extends AMP.BaseElement { | |||
| 'story-load-first-page-only' | |||
| ); | |||
| } | |||
| if (isExperimentOn(this.win, 'story-disable-animations-first-page')) { | |||
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Some thoughts on this:
- The experiment needs to be enabled for CSI tracking BEFORE the LCP metric is sent. Is it the case here?
- There are more cases where the animations are disabled (prefers-reduced-motion), I think it'd be interesting to capture this as well
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Good Qs
For 1: This is added on the buildCallback of a story (which happens before layoutStory_()), so it should happen before the LCP metric is sent.
For 2: We can trigger the CSI flag if prefers-reduced-motion is enabled, since that will also "disable animations on the first page". I don't think it'd be accurate if some of the users that have the reduced motion activated count towards this flag being OFF.
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have you tested (1) or is it working thanks to the render service?
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Tested it, it works
gmajoulet
approved these changes
Jul 22, 2021
newmuis
approved these changes
Jul 27, 2021
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There's multiple ways LCP can get affected by animations on the first page:
There could potentially be more causes for LCP problems through animations, which is why we'll disable the animations on the first page. Launching the experiment for
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