I use netbeans 7.3.1, i have found here one way how to make netbeans faster: How to improve Netbeans performance?, but my problem is that my netbeans is to slow by project
Try to disable auto-scanning of sources. Make sure that you only modify the sources via Netbeans. According to the manual:
Enable auto-scanning of sources
When selected, the IDE will scan the source code of projects to detect any files that were modified externally. Scanning is triggered when the focus is returned to the IDE, for example when the user returns to the IDE from another application.
If your sources are only modified from within the IDE, you can probably disable auto-scanning with little risk of encountering problems. Disabling auto-scanning may improve IDE performance if you are working on large projects.
Auto-scanning is enabled by default.

Other than that it the network that causes the delay.