title: compute in 'package:flutter/foundation.dart'
body: <p>In my application, I need to do heavy processing (generating thumbnails of 3000 images). 
  When I am doing the processing in an async method, App UI freezes. I tried <a href="https://api.dartlang.org/stable/1.24.3/dart-isolate/dart-isolate-library.html" rel="nofollow noreferrer">Isolate</a>. It is working but looks over complicated. I found there is functionality <strong>compute() in  'package:flutter/foundation.dart'</strong> which is much simpler. When I launched 1000 compute at the same time, it causes App crash. </p>
  
  <p>Is there any limit for parallel <strong>compute()</strong> execution?
  Or is there any other way to achieve the same?</p>