We recently announced an update to the Rive extension. The updated extension will render Rive content much more efficiently with fewer draw calls and overall better performance. We updated a small sample game made with Rive to the new version and it is now definitely playable, even on web in a mobile browser!
Check it out for yourself here:
https://defold.com/sample-rive-game/
Source: GitHub - defold/sample-rive-game: Sample project showing how to use Rive animations in Defold