Speed-optimize large WordPress membership site

After upgrading to the latest WordPress version our home page became 4-5 times slower. Once that is debugged and fixed, the whole site needs to be speed-optimized.

The site is at http://bestinternetmarketingsecrets.org and a duplicate version running faster on the previous version of Wordpress can be seen at http://knightsmain.com/staging
The site is a BuddyPress site using the DynamiX theme.

If you are interested in applying for this job, reply and we will send you all the specific details.