Slow sysupgrade in D-Link DWR-118 A1

Does someone know why sysupgrade in D-Link 118 A1 is so slowly? Takes about 10 minutes. I have a few others router like Netgear or tp-link, in which upgrade takes about 1-2 minutes.

The git-commit that added support for the DWR-118 A1 already mentions this, but doesn't explain why. :-/

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Large SPI-NOR flash, small sector sizes (erase block sizes) do take their time.