Background Scanning Process for first NetBeans start took more than 15min

Steps to reproduce:

• Open NetBeans 11.0 for the very first time
• Choose yes to import settings from NetBeans 10.0 (No plugins, just settings)
• After NetBeans opens, It imported 33 projects from my old NetBeans instance.
• Install nb-javac.
• It opens the projects.
• Background scanning comes ups, need couple of minutes
• Because of some HTML5 projects, Oracle JS Parser implementation installer comes up
• Install Oracle JS Parser Implementation.
• After first background scanning is finished the next one is coming up and takes even longer.
• Waiting until everything is finish. Round about 15-17 min.

I added a heap dump, created via Visual VM (In case of sensitive data, I removed the link, please give me a private link where I can upload it.

No I don't want to not use importing settings. First it is possible and needed and second because it is not a real world case. I want my settings from my old IDE and all my opened projects. I don't want to import/open them one after one again, this is not a use case. And I don't want to make the settings again and again, switching to a new version. Of course it will not running as long as I open NetBeans w/o importing settings and opening all projects but again this doesn't make sense.

My projects are:

• 5 Maven
• 1 PHP
• 4 HTML5
• 14 Ant based NetBeans modules (Some 3rd-party, some from the Core)
• 8 Maven based NetBeans modules (all 3rd-party)
• 1 NetBeans Module suite project

What information do you need more? I will add the messages.log too, but I need to clean up my user dir again, because I opened NetBeans after the profiling again.