[Interest] Performance of Qt scripting on iOS

[Robert Iakobashvili]

Not about JS/QML performance, but my Qt widget-based apps on iOS are
very fast where
long operations on new iOS devices are about twice faster (average for
several long operations)
than on latest Android devices of the same class.

Note, that the same apps on iPad Air-2 is about 10 times faster than iPad-2.

Memory consumption with widgets is known to be less.

So, is it some business case for Qt-widgets?


Regards,
Robert


On Tue, Jul 14, 2015 at 1:40 PM, Gian Maxera <gmaxera at gmail.com> wrote:
> Yes … that’s the reason. Of course having only a dual core does not help.
> To avoid bad user experience, I wrap the delegates into Loader items, or the whole view into a Loader, and I create a fast overlay displaying a “Loading” message that disappear when the Loader complete to load everything.
>
>> On 14 Jul 2015, at 11:37, Nuno Santos <nunosantos at imaginando.pt> wrote:
>>
>> Is that the reason for the sluggish performance of Qml delegate instantiation?
>>
>> My app runs awesomely on Android but no on iOS. Specially regarding ListView delegate installation process. It completely hangs. I have always thought that the main reason was the fact that the Android device is a quad core and the iPad 2 a dual core.
>>
>> Nuno
>>
>>> On 14 Jul 2015, at 11:34, John C. Turnbull <ozemale at ozemail.com.au> wrote:
>>>
>>> It's well known that iOS does not support executable memory which means that any scripting language would not be able to use a JIT compiler.
>>>
>>> Given this, wouldn't it mean that Qt's JavaScript implementation would run like a one legged dog on this platform and therefore be practically unusable?
>>>
>>> -jct
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