Drop a Lottie .json anywhere on this page to compile it.
lottie-web (reference)
ulottie (compiled)
What the compiler decided
load an animation
First load — what a page downloads
Raw
Gzipped
vs lottie-web
load an animation
Runtime — measured in this browser, now
lottie-web
ulottie
difference
press Measure
tinybench, with style and layout forced inside the
timed region — without that the numbers describe attribute writes, not rendering,
and flatter ulottie. Paint and raster are still outside what any synchronous
measurement can see.