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(Mac) hardware and performance

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Hi
Have encountered a performance bottleneck in an application that makes heavy use of video effects.

On my home iMac I get an acceptable 35-40 fps.

On my work iMac I get an unacceptable 5fps!!

Home iMac
Intel Core i7
Processor Speed: 3.4 GHz
NVIDIA GeForce GTX 680

Work iMac
Intel Core i5
Processor Speed: 2.7 GHz
AMD Radeon HD 6770M GPU.

both 4 core single processor.

I need to confirm the GPU on the home machine...

Based on the above would it make sense that the GPU is the bottleneck?

Also, since I am deploying on a Mac mini, wonder how it will perform in comparison with my home i7 iMac

Mini specs
2.8GHz dual-core Intel Core i5 (Turbo Boost up to 3.3GHz) with 3MB on-chip shared L3 cache
Intel Iris Graphics GPU


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