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There have been reports of very significant performance drops in invokedynamic/method handle performance resulting in lots of time being spent in java.lang.invoke.MethodHandleNatives.setCallSiteTargetNormal.

[1]: http://mail.openjdk.java.net/pipermail/nashorn-dev/2016-March/006024.html
[2]: https://groups.google.com/forum/#!topic/jvm-languages/aXH7RwoLIqQ

These slowdowns occur at seemingly random time during runtime [2] or when re-evaluating big scripts in fresh Nashorn script engines [1]. The process may or may not recover back to normal speed [2].