title: Suspense fallback takes very little time with react router v6
body: <p>In my project I' m using react-router and Suspence for rendering multiple lazy pages.
  The only problem id that the LoadingSpinner, that is the fallback prop of the Suspence component, loads for only 0.2ms when you go from one page to another. This duration is so short that it is not even visible to the naked eye</p>
  <p>The App.js code:</p>
  <pre><code>import React, { lazy, Suspense } from 'react';
  import { Routes, Route } from 'react-router-dom';
  
  import { AppContainer, RedirectComponent } from './app.styles';
  
  import SearchField from '../components/search-field/search-field.component';
  import ErrorBoundary from '../components/error-boundary/error-boundary.component';
  import LoadingSpinner from '../components/loading-spinner/loading-spinner.component';
  import RefreshRoute from '../components/refresh-route/refresh-route.component';
  
  const PageNotFound = lazy(() =&gt; import('../pages/page-not-found/page-not-found.component'));
  const MainPage = lazy(() =&gt; import('../pages/main-page/main-page.component'));
  const CurrentForecast = lazy(() =&gt; import('../components/current-forecast/current-forecast.component'));
  
  const App = () =&gt; ( 
    &lt;AppContainer&gt;
      &lt;RedirectComponent to='/'&gt;GO TO HOME PAGE&lt;/RedirectComponent&gt;
      &lt;SearchField /&gt;
      &lt;ErrorBoundary&gt;
        &lt;RefreshRoute&gt;
          &lt;Suspense fallback={&lt;LoadingSpinner /&gt;}&gt;
            &lt;Routes&gt;        
                &lt;Route exact path='/' element={&lt;MainPage /&gt;} /&gt;
                &lt;Route exact path='/details/:detailsID' element={&lt;CurrentForecast isMainPage={false} /&gt;} /&gt;            
                &lt;Route exact path='*' element={&lt;PageNotFound /&gt;} /&gt;            
            &lt;/Routes&gt;        
          &lt;/Suspense&gt;
        &lt;/RefreshRoute&gt;
      &lt;/ErrorBoundary&gt;
    &lt;/AppContainer&gt;
  );
  
  export default App;
  </code></pre>
  <p>How can I make sure that it has a minimum duration?</p>