title: UI GRID insanely fast vertical scroll issue
body: <p>I used UI Grid in my project and below is a snapshot of the <code>gridOptions</code> variable that I used. The Problem is everything was working fine. But from past 1 or 2 weeks the vertical scroll is insanely scrolling on just a single scroll. Since <code>multiSelect</code> is set to true the clients are unable to check/select specific records the scrollbar scrolls insanely (this happens when user scrolls just once) and the scrollbar reaches to the bottom of the table.</p>
  
  <p>Version :  <strong>ui-grid - v3.2.1</strong></p>
  
  <pre><code>this.gridOptions = {
        appScopeProvider: this,
        infiniteScrollRowsFromEnd: 20,
        enableSelectAll: true,
        multiSelect: true,
        enableColumnResizing: true,
        saveScroll: false,
        saveFocus: false,
        saveGrouping: false,
        enableFiltering: true,
        saveGroupingExpandedStates: false,
        saveTreeView: false,
        infiniteScrollDown: true,
        useExternalFiltering: false,
        useExternalSorting: false,
        enableCellEditOnFocus: false,
        enableCellEdit: false,
        enableRowSelection: true,
        enableFullRowSelection: true,
        enableGridMenu: true,
        enableSorting: true,
        exporterCsvFilename: 'ClientResults.csv',
        exporterCsvLinkElement: angular
  
        //sorry cant share other code
  </code></pre>
  
  <p>Can anyone help whats wrong.</p>
  
  <p>PS: There are total 2000+ records in the table. Also this happens only in chrome and behaves normal in Firefox.</p>