Split image in PHP

lol php.

anyway gd's imagecopy() takes days splitting a 10000x10000pixels image into 100x100px slices. How do I get more speed?

Convert it to a bitmap format using GD, then write your own splitting routines on the resulting flat file that don't read the entire thing into memory.

i.e. (initial format of large image) -> large BMP ----> BMP tiles -> (final file format of tiles)