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3524 files with 395.980 line of code, totalling 79.2 mb.  Is it the volume size that make it slow or number of code ?  seems databinding (another annotation processor) also have similar number for volume size, but not taking that long.

i tried with 8kb and 32kb buffer size but seems it remain the same, in the flamechart now it adds buffer. Anyway thanks for pointing about it.

Thanks stefan, seems using replace outputstream seems to solve my issue. Currently parceler annotation takes less cpu than dagger and databinding.

This is the svg file if you want to check the full graph. By the way if now  17% spent for annotation, how much it is impacting the total build time  ? Let say if the total build is 10 minutes. Because as you said earlier that the percentage here does not always reflecting the build speed directly.