Firefox runs the game well on the Mac, while the Neutralino build (presumably using the WebKit shipped with Safari) experiences some performance issues. Can you replicate the performance issues with Safari? If so you might be able to glean some insights from https://webkit.org/web-inspector/timelines-tab/
When profiling, it can often be useful to compare profiles of "working well" versus "not working well". So you could record a 10 second timeline when things are going smoothly, then a 5 second timeline when perf is bad - things that jump out on the second timeline are worth looking at.
When profiling, it can often be useful to compare profiles of "working well" versus "not working well". So you could record a 10 second timeline when things are going smoothly, then a 5 second timeline when perf is bad - things that jump out on the second timeline are worth looking at.