Newbie suggestion

[info]

Hi,

Im owner of small of web agency. I develop website in prestashop and wordpress.

I use vps and dedicated server with plesk. Lateley plesk in vps and dedicated server is very slow.

I dont know if fault of my server provider... my question is

CloudLinux is a OS...can you suggest for my client with site in prestashop and wordpress?

I like plesk but i dont understand what is wrong...