how much overhead is there for a findWorkflowInfo() call?

I'm working on a java-based OperationAdvisor for the workItemSaveAction. I'm looking to see if the newState is in the IN_PROGRESS state group in the work item's workflow. I'm using this code:
IWorkItemCommon workItemCommon = getService(IWorkItemCommon.class);
IWorkflowInfo workflowInfo= workItemCommon.findWorkflowInfo(workItem, null);

//we only need to check for IN PROGRESS state groups. Open and Closed state groups are okay. if (workflowInfo.stateGroupContains(IWorkflowInfo.IN_PROGRESS_STATES, newStateId)) {
 ...do stuff
}

I'm wondering how much overhead is introduced in that findWorkflowInfo() call and the workflowInfo.stateGroupContain() method?  My workflows do not change *that* much so I could have a static list of the In Progress states for each work item and just look them up directly in the code.  This is on a save, so I don't want to introduce too much delay and processing purely on a Save.

Susan