Hi @Chris Hutchings ,
In Microsoft SQL Server 2008, you see that the CPU usage of the resource monitor is very high when the virtual memory is running low on the server. Did you monitor the memory usage of your SQL server? You can get the memory usage from SSMS Memory Consumption report.
Refer to the blog High CPU consumed by Resource Monitor due to low virtual memory and Finding Resource Usage Details in MSSQL to get more detail information.
>Was wondering is this a new bug with SQL 2019 or other ?
I could not reproduce your issue in my environment.
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