ngUpgrade performance considerations
<p>I am trying to figure out if we can move our Angular 1 application to Angular 2.  We have a sufficient amount of code to warrant using <code>ng-upgrade</code> as opposed to starting from scratch.</p>

<p>Our current application is pushing the performance limits of what Angular 1 is capable of.  Hopefully Angular 2 will bring us some performance benefits.  </p>

<p>My question is how much of an impact on performance our migration path will have (i.e. running Angular 1 alongside Angular 2 as per <code>ng-upgrade</code> guidelines)?  Will it have a noticeable impact or will it not be noticeable in practice? My main concern during this period is run time speed as opposed to memory usage or load time.</p>