There can be various causes. All of the items that are known to cause high CPU usage are documented here:
High CPU Usage | Inactive User Interface | Poor Performance | Long Time to Load Chart Data | Charts Reloading Often
Start by referring to:
High CPU Usage | Inactive User Interface | Poor Performance | Long Time to Load Chart Data | Charts Reloading Often: 30.16 - What to do if Sierra Chart is in a frozen state for an extended time due to extended high CPU usage caused by an automatically or manually opened Chartbook
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