All info is attached at my first post. PHP 5.1.6 & mySQL 5.0.24 Community Edition.
I'll try out your suggestion.
The 1:1 replacement of with your config caused mySQL not to start anymore so I replaced just some major commands with my existing one. Still there is no speed up at all. I'd say you did just copy for configuration so it is not any helpful in my case.
Thanks for the efforts anyway.