http://www.zwsoft.com/forum/viewthread.php?tid=1741 Dear Atabey, I tried this code in lsp file, it works fast in 2010 and 2011 version. May I know what is your ZWCAD version? Also, I think this may be one sentence in your lsp file, so could you send us the whole lsp file that containing this line which works slow? Thanks, our email is <a href="mailto:tech@zwcad.com" target="_blank">tech@zwcad.com</A> Atabey37 2011-03-03 19:12:50 http://www.zwsoft.com/forum/viewthread.php?tid=1741&pid=13346 hi m8 there is a problem your code!!! not equal this code my code!! if there is layer "1" your code dont work... for exp : your drawing there is Layer "1" and layer color "5" your code cant chage it but my code change it !!! m Atabey37 2011-03-09 08:32:19 http://www.zwsoft.com/forum/viewthread.php?tid=1741&pid=13331 Dear Daniel, i use ZWCAD 2011 Pro trial version. and this lisp work very slow in big files..( over 2 MB dwg files) (this lisp work fast little files) but same lisp fast work on autocad even big files ( over 2 MB dwg files) (DEFUN C:ZZ ( / ) (COMMAND "LAYER" "MAKE" "0" "COLOR" "0" "" "") (COMMAND "LAYER" "MAKE" "1" "COLOR" "1" "" "") (COMMAND "LAYER" "MAKE" "2" "COLOR" "2" "" "") (COMMAND "LAYER" "MAKE" "3" "COLOR" "3" "" "") (COMMAND "LAYER" "MAKE" "4" "COLOR" "4" "" "") (COMMAND "LAYER" "MAKE" "5" "COLOR" "5" "" "") (COMMAND "LAYER" "MAKE" "6" "COLOR" "6" "" "") (COMMAND "LAYER" "MAKE" "7" "COLOR" "7" "" "") (COMMAND "LAYER" "MAKE" "8" "COLOR" "8" "" "") (COMMAND "LAYER" "MAKE" "9" "COLOR" "9" "" "") (COMMAND "LAYER" "MAKE" "12" "COLOR" "12" "" "") (COMMAND "LAYER" "MAKE" "30" "COLOR" "30" "" "") (command "COLOR" "BYLAYER") ) Atabey37 2011-03-04 07:52:59 http://www.zwsoft.com/forum/viewthread.php?tid=1741&pid=13323 hi (COMMAND "LAYER" "MAKE" "1" "COLOR" "1" "" "" ) why this command take very long time in lsp file!!! Atabey37 2011-03-02 08:50:35