This source shows you, how you can use Graphics/WriteChunkyPixels instead of Graphics/WritePixelLine8 or Graphics/WritePixelArray8 if possible.
PERMSSN UID GID PACKED SIZE RATIO CRC STAMP NAME ---------- ----------- ------- ------- ------ ---------- ------------ ------------- [generic] 1452 4156 34.9% -lh5- 9ec0 Aug 2 1995 DisplayChunky.s ---------- ----------- ------- ------- ------ ---------- ------------ ------------- Total 1 file 1452 4156 34.9% Aug 3 1995