My team inherited a 70%-complete AngularJS application, the user interface for a passengers and crew on a new series of airplanes. It worked fine enough on mode

My team inherited a 70%-complete AngularJS application, the user interface for a passengers and crew on a new series of airplanes. It worked fine enough on modern tablets and phones, but there were also some interface devices hardwired into the planes, which would be very challenging to update at this point, and on those devices the software ran very slow. Through several experiments, we determined that the sluggishness was unfortunately coming from AngularJS. We tried some performance improvements, but it wasn't getting very far. We built some prototypes using other Javascript frameworks, and found VueJS gave us the best performance. Management was concerned about us rewriting. The end customer was concerned about us rewriting. So risky! But we saw no other way to deliver adequate software performance. We got done on time, with great system performance, to the accolades of a very happy end customer.