website too slow and images not showing in php website

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http://askubuntu.com – i have a webserver on which a website is hosted. server configured with php version 5.2.6 mysql version 5.0 website is working fine on this server. now i want to migrate this website to another server which configured with php version 5.3 mysql version 5.1 the problem is that after migrating the website. site is opening too slow also the images are not showing only white background and text is appearing. error logs also not generating. Help me with this. Thanks in advance. (HowTos)