Since you want to render using "GPU", why not just use "Starling" instead and rely on the "Air SDK GPU" option? As far as I know, this so-called "GPU" option cannot fully utilize "GPU"

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Since you want to render using “GPU”, why not just use “Starling” instead and rely on the “Air SDK GPU” option? As far as I know, this so-called “GPU” option cannot fully utilize “GPU”

AIR apps are seemingly automatically switching from GPU renderMode to CPU renderMode mid-session #4243

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Want to render on GPU,
To improve rendering performance, you can only use ‘starling’,
Instead of relying on the “GPU” option in the release,
Doesn’t the producer know?

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renderMode​

optional

Specifies whether to use graphics processing unit (GPU) acceleration, if supported on the current device. This can be set to one of the following values:

  • auto (default) — currently falls back to CPU mode.

  • cpu — hardware acceleration is not used.

  • direct — rendering composition occurs in the CPU; blitting uses the GPU.

  • gpu — hardware rendering acceleration is used, if available.

Note that direct mode is required in order to use Stage3D APIs and frameworks such as Starling.

Example​

<renderMode>direct</renderMode>
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I agree.

Starling was game changing. If one wants to utilise the GPU with AIR, that’s how it’s done. The only exception that comes to mind is if one is simply creating a video player, in which case the native flash.media.StageVideo class is worth considering.