I didn't understand why Unity bothered trying this in the first place, so it's not surprising they gave up. The obvious places for Unity to go would be WebGL/ASM.js and NaCl (which I assume would be borderline trivial for them to support). It would be awesome if they revisited their "JavaScript" implementation and made it a bit less unpleasant to work with while they're at it.
According to Eich's talk Friday, ASM.JS is around 2x slow as native, which is acceptable, but should improve. Before that other WebGL solutions were 10x+ native.
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I didn't understand why Unity bothered trying this in the first place, so it's not surprising they gave up. The obvious places for Unity to go would be WebGL/ASM.js and NaCl (which I assume would be borderline trivial for them to support). It would be awesome if they revisited their "JavaScript" implementation and made it a bit less unpleasant to work with while they're at it.
ASM.JS has only existed for a short time.
According to Eich's talk Friday, ASM.JS is around 2x slow as native, which is acceptable, but should improve. Before that other WebGL solutions were 10x+ native.