I have a 4GB VPS, just LAMP and no control panel installed, just SSH.
Varnish is installed on server but not working (so disabled at the moment), need you to set-up Varnish on server and configure the Varnish Magento plugin. Check Varnish is working and also check the Magento Varnish plugin works also, eg. if I 'clean' cache at plugin it cleans Varnish output.
Check APC and Memache and working correctly and check my [url removed, login to view] file has the right data for APC/Memcache settings.
Finally, a quick checked that MySQL is optimised well for Magento and advice / check on anything else that might help.
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