WordPress Changing Domain problem – Urgent Help Required

Hello,
I Installed my wordpress on zemtv.com/videos
then after some time due to some reason i shifted it to zemtv.com by moving the files to new location and changing the address in Dashboard > settings.

But unfortunately i had to change my domain so i bought zemtv.net, copied the files to new domain(same host), changed the url from Dastboard > Settings . redirected previous domain to new one . my new domain was up and running but the site took some time to open and while publishing new post it takes almost 30sec – 1min to publish the post.
then i read http://codex.wordpress.org/Changing_The_Site_URL, and edited wp-config file and added these two lines
define(‘WP_HOME’,’http://www.zemtv.net);
define(‘WP_SITEURL’,’http://www.zemtv.net’);

but i found no progressive, Please help me out