Any suggestion on how to optimize geo lighting on KarmaXPU ?

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Any suggestion on how to optimize geometry lighting on Karma XPU.
I rendering this scene on both Karma xpu and arnold GPU to compare the speed.

the result with geometry Light and emission meterial:
karmaXPU avg 8-23 minute/frame
arnoldGPU avg 4-6 minute/frame

the result without geometry Light and emission meterial:
karmaXPU avg 1-4 minute/frame
arnoldGPU not tested
Edited by OOYYAT - June 5, 2022 10:48:36
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by the way the material i use is materialX for karma XPU

for arnold i use arnold standard surface material.
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Until mesh light is officially supported by XPU, my workaround is to set the emissive material intensity to 1(greater values produces unusable noisy results, for me), in order to still get the proper primary,reflect,refrect rays etc. Meanwhile I place an actual light to illuminate the surroundings.
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Seawise_Giant
Until mesh light is officially supported by XPU, my workaround is to set the emissive material intensity to 1(greater values produces unusable noisy results, for me), in order to still get the proper primary,reflect,refrect rays etc. Meanwhile I place an actual light to illuminate the surroundings.

instancing point light to point.
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