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Improvement
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Resolution: Won't Fix
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Minor
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Pipeline - October, Pipeline - April 2018
As a user of pipeline, I WANNA GO FAST. 
One problem is that we have a bunch of mutable state attached to the WorkflowRun, and in the CpsFlowExecution, which results in constantly saving-and-re-saving the run, costing IO, CPU, and creating garbage to GC.
How do we fix that?
- Move the CpsFlowExecution fields heads and iota OUT and into either the program or the storage.
- May need to do some stuff in workflow-job plugin to accommodate the new impl – though it's created abstractly here – https://github.com/jenkinsci/workflow-job-plugin/blob/master/src/main/java/org/jenkinsci/plugins/workflow/job/WorkflowRun.java#L263
I think this is going to be pre-empted by other work we're doing – don't want to go into details yet until we're 100% settled on some parts of it, but it will be addressed from a radically different direction and I don't see the point in addressing it in the way described.