There is following performance regressions in Controls.TreeView-Expand.adhoc-items1000-wide observed
on windows7-high machine:
   -23%, 460 fps => 354 fps


The regression first appeared in build 8.0-controls-scrum-h51 which contains following changes:
  1. RT-23461: partition css selectors into maps for faster lookup (detail)
  2. branch merge (detail)
  3. branch merge (detail)
  4. RT-23461: partition css selectors into maps for faster lookup (detail)
  5. RT-22076: use bits for styleclass (detail)

The regression still exists in latest available hudson build 8.0-controls-scrum-h61.

I can easy reproduce it on windows7-high machine as well as on my WindowsXP Dell laptop.
JPA analysis shows that the time spent in javafx.scene.Noe.impl_processCSS(StyleManager, boolean) has
been increased in twice:

#50
 6.399 javafx.scene.Node.impl_processCSS(com.sun.javafx.css.StyleManager, boolean)
       4.968 com.sun.javafx.css.StyleHelper.transitionToState(javafx.scene.Node)
       1.417 com.sun.javafx.css.StyleManager.getStyleHelper(javafx.scene.Node)

#51
12.359 javafx.scene.Node.impl_processCSS(com.sun.javafx.css.StyleManager, boolean)
       7.017 com.sun.javafx.css.StyleHelper.setStyles(com.sun.javafx.css.StyleManager)
       5.320 com.sun.javafx.css.StyleHelper.transitionToState()



Steps to run TreeView-Expand benchmark:
> cd JFX_WS/tests/performance/Controls/
> ant
> java -Djavafx.animation.fullspeed=true
       -cp "JFX_HOME/rt/lib/jfxrt.jar;./dist/Controls.jar;../FXBenchmark/dist/FXBenchmark.jar;../../../import/benchmarks-2.1.1/benchmarks-2.1.1.jar"
       jrockit.bm.Main controls.bm.TreeViewExpandBenchmark -i 1 -wt 0 -tr 60 -type depth -size 1000


Btw, the same regression is also seen when running with treeview size of 10 elements ("-size 10").

Note, you need substitute real path for JavaFX (JFX_WS, JFX_HOME variables).