In IIS Application Pool setting, Ther is option "Maximum CPU usage", Suppose I have 4 core CPU so Max limit is 400% or 100%?
IIS Application Pool setting: maximum CPU usage - This value is up to 100%, however, set Limit (percent) to a value below at least 80%. I recommend 60% (in most instances) to ensure enough CPU is available for the Windows. Useful information was found How to adjust an IIS application pool in Plesk? – Plesk Help Center and How to limit CPU usage in IIS • Conetix.