The regression is caused by the `Collections.unmodifiableSet` wrapper not being recognized by `BitSet`, and a fall back is done to a less optimized version of `containsAll`.
As this is a regression fix, I've kept the fix as small as reasonable. I'll provide a further optimized version as part of https://bugs.openjdk.org/browse/JDK-8322964 which eliminates the need for `BitSet` and `StyleClass` in the hot code paths which should result in a further CSS performance improvement. I've tested this solution with the JFXCentral application locally and the regression seems resolved. ------------- Commit messages: - Fix regression Changes: https://git.openjdk.org/jfx/pull/1314/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1314&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8322795 Stats: 6 lines in 1 file changed: 2 ins; 0 del; 4 mod Patch: https://git.openjdk.org/jfx/pull/1314.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1314/head:pull/1314 PR: https://git.openjdk.org/jfx/pull/1314
