[Interest] QJSEngine vs. (deprecated) QScriptEngine performance - old thing winning!

Ulf Hermann ulf.hermann at qt.io
Wed Oct 12 11:40:42 CEST 2016

> QJSValue result = qmlEngine.evaluate(item.m_expression.sourceCode());

I guess you are mostly profiling the JIT compiling, not the actual evaluation. In order to get realistic results you should keep the compiled representation of the expression around, e.g. as a JS function. From the docs:

> QJSValue fun = myEngine.evaluate("(function(a, b) { return a + b;})");
 > QJSValueList args; args << 1 << 2;
 >QJSValue threeAgain = fun.call(QJSValue(), args); regards,

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