Does Flutter Web's "compute()" work on it's own thread or web worker, or how does it work?

Question

If I do this, for example:

FutureBuilder(
   initialData: null,
   future: compute(expensiveParsingOperation, data),
   builder: (context, snapshot) {
       if(!snapshot.hasData){
          // This doesn't spin (frozen).  The entire UI is janked until the expensive operation future completes.
          CircularProgressIndicator(); 
        }else {  
             Container(); 
         } 
});

I expected the above to send expensiveParsingOperation function to a web worker or something and not jank the main thread, but this is not what is occurring in my observation.

Answer 1

compute does nothing on the web platform at this time see https://github.com/flutter/flutter/issues/33577