How to calculate number for setting BATCHER2D_MEM_INCREMENT?

Hi all, my game got about 200 drawcall, version 3.7.2, I found that, I can change setting BATCHER2D_MEM_INCREMENT from 144KB to 2303KB, number of drawcall is decreased to about 50 drawcall. I wonder how to calculate number for setting BATCHER2D_MEM_INCREMENT. Can I depend on some debug info?
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It doesn’t need to be precise, just choose the memory chunk size you can afford in your game, if you don’t want to waste, just test with the most complex scene (with 2d elements), and check whether increasing / decreasing will change draw call, make sure it reduce the draw call with the lowest memory chunk size

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Thanks alot for your reply.