Question
How to check hardware usage (CPU, Memory, disk I/O) consumed by a process of a website?
Answer
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Go to Tools & Settings > Process List (under Assistance and Troubleshooting). Note: If Process List is not available, make sure that the Repair Kit Plesk Extension is installed and enabled.  
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Click Domains only to exclude system processes. 
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Turn on Auto-update of resource usage to track processes in real time. Note: To sort the processes by CPU usage, Memory usage, Disk I/O (read), Disk I/O (write), click on the corresponding column. 
