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Times of processing bigger files resS (tested on 1.5Gb) depends on DeltaApplier buffer size #76

@olehgavrilyuk

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@olehgavrilyuk

When processing update for a large file of resS, times of updating are big (more then 2 minutes).
This is due to DeltaApplier creating blocks of memory of size 4mb, for streams application.
If we reduce the memory size of the buffer to just 1kb, we get progressively better processing times (up to 10-15 seconds).
Why initial memory sizer of 4Mb was selected? Were other values tested as well?
Will it be ok to decrease it to 1kb as it gives a substantial boost to update of the big files.

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