How to optimize PHP & MySql to speed up your blog site?

[passiondance]

Hello all,
I'm trying to find out the solutions for my blog site optimization.
I've optimized all images but it helps decreasing download time only 2 seconds.
The database of my site is very big; Thailand Travel Online (http://www.thailand-travelonline.com/).

Any suggestion?
Tnx.

[Horus_Kol]

Double post - conversation is at:
http://www.htmlforums.com/php-programming/t-how-to-optimize-php-mysql-to-speed-up-your-site-106754.html