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QWebkit: V4 is really slow compared to V8 for large sources

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My goal is to build a javascript framework rendered in a QWebView, not using Qml, just standard javascript. My library is near 1Mb of pure compact javascript with a lot of great ui components. I do that because my sources can be run locally (desktop mode) & remotely (cloud mode). On QT5.1 (with V8 engine), loading & running such library was 125ms (more than acceptable) Now on QT5.2 (with V4 engine), loading & running is 1480ms… same result with QT5.3 more than 10 times slower. Do any body got an idea ? Must I use the old QT5.1 to get acceptable performances ?

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