In my experience, DataViews are way slower than typed arrays, and it's a 
known issue <https://bugs.chromium.org/p/v8/issues/detail?id=3533>. They 
delegate to C++ instead of generating code at runtime for it (with just 
SMIs, it's comparable to a standard function call in generated assembly 
length), which is probably the bigger slowdown (it's faster there than even 
in normal JS).

On Thursday, November 3, 2016 at 7:01:37 AM UTC-4, vroad wrote:
>
> Well, changing loop statements improved performance. But batching is still 
> too slow on mobile devices..
>
>
> https://github.com/openfl/starling/blob/b1a458f7283a7e3673146049a6c05124ecd3d7fe/starling/rendering/VertexData.hx#L248-L260
>

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