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The Maven Indexed download takes very very long on low bandwidth configurations. Please add a value "Once a Month" in the drop down box "Index update frequency" of the Maven Options dialog.
you can disable the updates and perform them manually only. Additionally once the index is first downloaded, then the subsequent updates only download a diff from the last time (if the server side is working as designed)
I knew I could disable download, and it's what I've done. I think the problem occurs when you have a Snapshot Repository (https://repository.jboss.org/nexus/content/repositories/snapshots/ for instance) in your POM. Another strange thing with this drop down list is that it's not sorted.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss