Framworke 4 compatbility

[S.ImanG]

Hello,
I installed .net 4 on my server and configed a website to use framework 4 manually. Now I experiencing some problem on server that I'm not sure if it is related to .net 4 or not.
1- The host using .net 4 is very slow and it takes a while to respond to requests.
2- Plesk and related software like hord are very slow (support team told me it is because of np pool memory over use).

Thanks a lot.
Iman