You can check your CPU/Memory(RAM)/Disk I/O and other resource usage by logging into cPanel.
1. Login to cPanel https://yourdomain.com/cpanel (replace yourdomain.com with your actual domain)
2. Find CPU and Concurrent Connection Usage under Metrics in paper lantern theme or Resource Usage under Logs in X3 theme.
3. Click on [Details] or [Snapshots] for complete charts & graphs of your website's resource usage.