Hello,
I'm perfectly aware my bid is higher than your listed budget, but what you i think you need is a performance audit. The speed issues might be to the server hardware or config or a slow module.
Relevant Skills and Experience
To be able to determine why it's slow, i'll basically have to digg through the code and see where exactly is the performance bottleneck.
Proposed Milestones
$200 USD - Optimizing the speed ot the site
Question: can you please post the url of your site so i can have a look at it?
Thank you.