Drupal Site is very Slow

Hi all,

We are developing the E Commerce site in the Drupal 7.8 version , With the Help of Ubarcart module. We have almost completed the custom theming and in the eCommerce sections, we have completed till the checkout process of the product using pay-pal.

We are running the site in the local-host using Wamp server, And also having 203 tables in the DB. Now the site is very very slow in the local-host itself. Its taking nearly more than 30 mins for loading every page in the site. Please help us on this issue. And if required any other details reg, this issue. Please post the details, i ll replay it ASAP. I have to show my site for demo, please understand the urgency of the issue.

We have done the following things for speed up the site.
1. Disable the Update manager,Overlay, Devel Theme.
2. We have also installed same site in another desktop and facing the same issue :(.
3. We are using Batrik theme for admin section and Custom Theme for the Front end Section
4. We have changed the front end theme to Default Batrik theme, Site is in normal speed. And then when we applied our custom theme site get slow. How to increase the speed of the site by using the our custom theme.
5. I have used the zen theme as the base theme for my custom theme development.
Any help would be deeply appreciated.

Thanks and Regards,
Rajguru Baskaran