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I've ran a few QML tests on Android (reading/writing to/from an SQLite DB, displaying the results in a list, synching with a web API) and it seems reasonably fast. Did you identify something in particular that was making the app slow? Or was it just that the app was particularly complex?

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To my recollection, the worst performer was parsing all of the QML at startup. This did not impact us at first, but as we grew the QML portion it went from a noticeable delay at startup to an unacceptable delay. It was something on the order of 10-30 seconds (on rather high-powered workstations to boot) to parse all of the QML files for what amounted to less than a dozen UI screens.

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