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The code in Creo used for regeneration of models does not support multi-threading. When you have a multi-core CPU it is not going to show the CPU being used at a high level as the regeneration is only done by a single core. Patterns are known to require a lot of CPU cycles to regenerate. Assuming that rendering is handled by a PTC supported GPU then the geometry render would be handled by the graphics card and you can mitigate rendering time with display settings.

If you need to model the part with a large number of forms, then I would find a way to deal with the creation and regeneration of that geometry in a model external to the sheet metal part. You can then reference this geometry in the sheet-metal part using Top-down design tools, so the form geometry is not regenerated while you are working on the design in sheet-metal mode. You can further optimize workflow by putting the forming geometry at the end or as close to the end of the model tree as possible so that you can keep it suppressed until it is needed for use on the drawing or in the construction of a feature in sheet metal mode.

To create the geometry of your forms (dimples) surface geometry will regenerate in the least amount of time. When creating a solid version, the use of the geometry pattern function can be used to array the surfaces and solidify them. There is also the option in sheet metal mode to use the quilt form and reference a quilt created in an external model that is optimized for a fast regen time. This reference feature (i.e. external copy geometry) can be set to read only so that it never regenerates which may reduce regen in some cases.