Firefox works fine with it: http://jandemooij.nl/blog/2015/12/29/wx-jit-code-enabled-in-firefox/ http://jandemooij.nl/blog/2015/12/29/wx-jit-code-enabled-in-...

Firefox works fine with it: http://jandemooij.nl/blog/2015/12/29/wx-jit-code-enabled-in-firefox/ http://jandemooij.nl/blog/2015/12/29/wx-jit-code-enabled-in-... After that, the performance overhead was pretty small on all benchmarks and websites I tested: Kraken and Octane are less than 1% slower with W^X enabled. On (ancient) SunSpider the overhead is bigger, because most tests finish in a few milliseconds, so any compile-time overhead is measurable. Still, it's less than 3% on Windows and Linux. On OS X it's less than 4% because mprotect is slower there.