No, it's a JS runtime based on WebKit's JavaScriptCore JS engine. Performance claims should be taken with a grain of salt and are less likely to be the result o

No, it's a JS runtime based on WebKit's JavaScriptCore JS engine. Performance claims should be taken with a grain of salt and are less likely to be the result of the JS engine itself and more likely to be with some specific architectural choices (e.g. implementing certain things in native code instead of JS, better parallelism, more efficient event loop, etc etc). JS Platform = all the bits that make up the capabilities the JS code can access when it calls various APIs provided by the "platform" that connects to the OS. JS engine = the thing that implements parsing & executing the JS code as defined by various standards (e.g. ECMA2022) and implements a very small subset of APIs those standards define (e.g. how String and ByteArray work).