The FeatureReader and FeatureWriter are ideal candidates to allow concurrent data reading and writing, something that you can't do with multiple readers and writers right now. Adding these parameters is currently possible if you wrap them up in custom transformers like I explain in this webinar, but ideally you shouldn't have to go to this effort.
https://www.youtube.com/embed/YnCot12FA9ULooking forward to the performance gains this change would bring. In tests my timings suggest in some examples it reduces the readwrite times to a third or even less.
Cheers, Dave



