I haven't worked with stereo setups with this codebase yet, but as it is just wrapping underlying platform-specific GPU APIs, it should be a similar performance profile.

On average, running the Wasm guest code is about 80% of the speed of a native build I use. That is both dependent on what is running in Wasm and not a very scientific measurement - wander needs better benchmarks. We think that performance profile is sufficient for anything that needs a GPU except the highest-performance 3D games.