The default HealthChecks provided at IDMS installation should use very little CPU.
This article describes how to check how much is used.
Release : All supported releases
Component : IDMS
Use the following z/OS command in SYSVIEW:
At the end of the output, the following fields can be found:
These two fields represent the amount of CPU time the check used the last time it was run, and the maximum amount of CPU time the check has ever used for any one execution.
If using SDSF, use the CK command.