Useful when your logic can directly process a batch of result instead of one by one
$bufferIterator = new BufferedIterator(new FetcherIterator(new Service(), new FetcherBuilder(), 100);
foreach($bufferIterator as $results){
dump($results); //contains 100 items
$resource = new Resource($results, $composerName);
$composed = $composerManager->compose($resource);
$composedResource = $composed->getComposite();
$composedResource = new Collection($composedResource, $transformer);
$transformedRessource = $fractal->createData($composedResource)->toArray();
//got your transformed batch instead of processing one by one or any overhead
}