I am trying to figure out what kind of performance we need for every remote probe we need to use. We are running mostly Windows server so i am mostly stuck to WMI and Performance Counter sensors. According to your documentation (http://www.paessler.com/manuals/prtg/system_requirements.htm) I see that using a lot of WMI sensors is not reccommended, but i can't find information about Performance Counter sensors. What is exactly the difference between these 2? Is the use of Performance Counters a better solution for Windows Servers? Or is there maybe another solution?