>      I wanted to place about 4000 lines and 4000 markers on map,but
> the script runs very slow and the system hangs on.

Yes.  That's far too much for the client-side API to manage.

> Is there any simple
> way to do this or any optimization technique,help me plz

Try searching, example -
http://groups.google.com/group/google-maps-api/browse_thread/thread/59506737dbafd66e/bb546efd61344f70?lnk=gst&q=thousands+polygons#bb546efd61344f70

You might also consider what you actually need on the map - what
benefit will the end user get from seeing 4000 lines and 4000 blobs at
once?
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