Description of changes:
Lazy load gif and youtube embed, use optimized image formats for web, following some of Google PageSpeed Insights' recommendations.
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Issue #, if available:
Description of changes: Lazy load gif and youtube embed, use optimized image formats for web, following some of Google PageSpeed Insights' recommendations.
By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.