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