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what does this "backboardd" mean?

It seems this ops shows up many times, can anyone tell me what it is plz.?

• Instruments

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by MileStudio.

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what does this average frame time mean?

Hi, I'm using Instrument to profile my metal app, found a metric called display ( average frame time ) shows much longer than what expected. Is this truly the frame time ? Or did I misunderstand something ?

• Instruments
• Metal
• metal-cpp

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what is this coreanimation.offscreen encoder mean ?

this encoder happens to make gpu bubble, wondering what it is , and how to get rid of it, thx.

• Instruments

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question about gpu performance state and gpu activity

as you can see, gpu performance start earlier than gpu activity, i don't know why? thx

• Instruments

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by MileStudio.

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why there are so many display devices ?

I'm using instrument to profile my metal app, found there are more than one display devices shows on my view, I'm wondering what these display devices mean, thx .

• Instruments
• Metal
• Metal Performance Shaders
• metal-cpp

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by MileStudio.

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