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After switching from NB IDE to another application, and then switching back by Alt+Tab or refocusing click, the IDE hangs for about 2-3 seconds before repainting the window or responding to the input. NB 7.1 hasn't produced this on my machine and still works perfectly in this aspect, but in a clean install of 7.3 I got it from the very beginning. Note: it doesn't happen immediately after IDE startup. It takes to open any project to let this actually happen (closing all the projects later has no effect, the lag is still there).
I've been successfully able to pinpoint the source of the lag; it's caused by "History Clipboard" plug-in. Since it passed the verification for 7.3 ( http://plugins.netbeans.org/plugin/31336/history-clipboard ), there's obviously some corner case with either the IDE or the plug-in that lags on window repaint/refocus. Other plug-ins from older versions I use work without any signs of any problems, though.
Note: after disabling HC in 7.3/nightly (tested in both), everything seems OK. After re-enabling, it works OK until the first file from a project has been opened. In 7.1 HC works without any problems, though, so it's a regression of some kind IMO. And strike through the part about 'clean install' of 7.3 - I clicked 'import old plug-ins' during the install, so I haven't really noticed something was changed vs vanilla IDE.
reassigning to third party, b2s can you please take a look at this?