Since I have moved a site across from a test domain, the site had a slow "time to first byte".

I have optimised the site as much as possible as you can see from the two links below,

http://tools.pingdom.com/fpt/#!/OsbttkPJJ/http://www.atmevents.co.u...
http://gtmetrix.com/reports/www.atmevents.co.uk/LuCxT1L4...

Already tried:
Installed miser
Utilized gzip
Andrews zend cache fix
Cleared cache (files/cache, tmp)
Set up an automated job to clear zend cache,
Turned cache off on the site.

The site performed well before the move (sub 2 seconds) and the hosting provider has'nt changed and the database is on the same server as the core files.

However I've still got a hang that can be anywhere from 4 to 8 seconds before the rest of the sites is retrieved.

Any ideas and further sugggestions would be appreciated,

Thanks,
Tom