Hello,
I am Red Hat Certified System Administrator / Technician with over 6 yrs of experience in this field, have passed Unix level 2 exam here on Freelancer and have all positive reviews - please check my profile.
I specialize in speeding up of websites so I can cover server side fully and application side in regards of all kinds of caching and optimization.
Magento is quite tough, however I have speeded up several websites already and know, where the culprits are.
The question is - is your Magento e-shop on a VPS or is it just hosted by some webhosting provider?
Regards,
Andrej