PHP Fatel Error : Magento Site Very Slow - Pages Not Loading

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http://stackoverflow.com – My Magento site is very slow.(taking min 20-30 sec for home page loading) Right now there is no products, only site under the construction. We have only 200 categories/sub categories maximum. I have hosted my site in dedicated server. I have optimized basic page speed properties through magento admin panel. When i try to check the error log in SSH, it show me the below error message. #2 {main} thrown in /home/domainname/public_html/lib/Varien/File/Transfer/Adapter/Http.php on line 96 [09-Jul-2013 13:41:32 UTC] PHP Fatal error: SOAP-ERROR: Parsing WSDL: Couldn't load from 'http://domainn (HowTos)