The performance menu in Heroes of the Storm can help you diagnose and troubleshoot performance issues.
How to make a copy of one of your characters in the Public Test Realm and the Beta client
Assault on Broken Shore scenario needs to be completed before you can pick up this quest.
Troubleshooting steps for disconnections in StarCraft II
Troubleshooting steps for Diablo II (2000) performance issues
Troubleshooting for error "Unable to identify version"
System issues can cause World of Warcraft to crash with an Error 132: Fatal Exception! message.
How to troubleshoot issues with starting this scenario if it will not allow you to queue.