SharePoint 2013 Workflow Explorer

In my recent work, I need troubleshoot workflow performance issue. The site has hundreds workflow instances of different workflow definition spread across many lists.

I want a simple tool to be able view all these instances in one place without crawling through all the lists and no to mention the items. I also want to be able to suspend some of the instances in this explorer to find the workflow which caused the performance issue without affect customer's business as I can resume them after I am done.

As I can't find one avaliable, I build one with JSOM in App.