http://www.zwsoft.com/forum/viewthread.php?tid=1808 Hi joetan84, Could you provide me the info below: 1. your computer hardware: CPU'Grapic Card'RAM 2. your operating system 3. you ZWCAD version: check it in ZWCAD by command "VERNUM" 4. is it happen to every drawing or only some specific drawing? If it is special, could you send a sample file to <a href="mailto:tech@zwcad.com" target="_blank">tech@zwcad.com</A> ? Thanks joetan84 2011-06-22 20:15:51 http://www.zwsoft.com/forum/viewthread.php?tid=1808&pid=13622 What mouse are you using? Ive found in the past few days since we started using ZWCad, Microsoft mice and drivers make for a very, very choppy zoom experience, especially when you have raster images in a drawing file. Switch out to a Logitech mouse on the same system, and that issue is resolved 9minus the raster zooming, but that is another known issue). BryanS 2011-07-05 14:21:21 http://www.zwsoft.com/forum/viewthread.php?tid=1808&pid=13609 Thank for helping. Hoping can get it solve asap. joetan84 2011-06-23 21:58:41 http://www.zwsoft.com/forum/viewthread.php?tid=1808&pid=13601 1.Grapic card is ATI Mobility HD4330 RAM 2.GB 2. 32bit OS 3."2011.02.28(16649)" 4. so far as i know this drawing. but other dwg will be a lil lag and slow also. will send u a sample. joetan84 2011-06-22 23:21:59 http://www.zwsoft.com/forum/viewthread.php?tid=1808&pid=13596 i have a problem when using zwcad. when zooming deep into the drawing it become more slow n lag? it also happen to other computer as well in same drawing. joetan84 2011-06-22 04:38:29