Juste a Question...
 

I ask me what is the difference between psio et php_psio witout the fact that one is in php....

one is besser ?
one is faster ?
one use more ressource ?

php_psio = better (more features and updates)
psio = faster (powerbasic vs php)

I would recommend to use php_psio, it runs very fine, even on fast sites with much bandwidth.