>>279998940
Anyway, to answer your question, pitool customizes the vr compositor prior to exposing the headset to the OpenVR system so it can do brainwarp and set whatever your FOV and SS is set to. 
You would be better served figuring out what the hell is wrong with your network stack that a network protocol that only communicates with itself on localhost and a port for regular operation is jacking up your connection. Don't use 3rd party firewalls or "network tools". 
If you're running a vpn, do it on your router, not your pc.