This job is in two parts:
1) I need to upgrade my 2.2 wordpress (about 5/8,000 uniques/day), and after upgrade main plugins must be checked and - if needed - upgraded, in particular wp-cache.
2) Also, I need an analisys of which section or which plugins causes high php/cpu usage. After a week I'd like to know if is better to disable some plugins or which optimization are required.
Instant escrow, payment after the point 2) (one week I think)
In the future we could work together to optimize other websites.