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The 5.5 release does not specifically turn off Apple's Quartz renderer. Performance of NetBeans appears to suffer. Using the Java software renderer, by turning off the Quartz renderer, tends to show great improvement in execution speed. To turn off the Quartz renderer, add switch to either etc/netbeans.conf under default_options, or in the bin/netbeans execution script: -J-Dapple.awt.graphics.UseQuartz=false
Addendum: Turning off Quartz rendering does cause other issues, notably rendering problems in the help window. Hm.
Looking at the issue #83271 it seems that it is better to stick with defaults than have functional problems. Also it can be a tradeoff where performance improvement at some places is balanced by very slow functionality elsewhere.