Gray Scale slow start


When I start gray scale image raster, the first lines starts too slow, but after few lines everything comes running as it should be.
did some one have this problem?
By the way my version is not the last one, with my licence the most update version that I can use is 0.9.11
Controller MKS Sbase(32Bit) GRBL-LPC firmware version 1.1F

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