Rx.Observable
   .from(hugeArray)
   .bufferCount(10)
   .delay(5000) //want to wait 5 secs
   .flatMap(e => e) // this needs to go after to flatten the array, buffer spits out arrays of entries
   .flatMap( (data, index) => Rx.Observable.create(observer => {
       // going to render stuff here
       observer.onNext(data)
       observer.onCompleted();

   }))
   .subscribe(val => console.log('Buffered Values:', val));

Rx.Observable
    .from(hugeArray)
    .bufferCount(10)
    .concatMap(data => Rx.Observable.of(data).delay(5000))
    .flatMap(e => e) // or mergeAll() or concatAll()
    .flatMap( (data, index) => Rx.Observable.create(observer => {
        // going to render stuff here
        observer.onNext(data);
        observer.onCompleted();
    }))
    .subscribe(val => console.log('Buffered Values:', val));