Modern mobile devices run Construct games really well. I haven't seen any performance issues with any modern devices for some time now - usually if someone's complaining about performance, it's something like someone digging out a 7 year old device that isn't actually in practical use any more, and getting kicked down to software rendering due to GPU driver bugs. And even that isn't because of Construct, WebView or HTML5: ironically, it's the native code in the graphics driver that is broken, and everything else is working just fine. It's always been frustrating that people blame problems on things like HTML5 even if they aren't actually anything to do with the problem. In fact it's probably is something that has held us back: if people know we use HTML5, and they have some problem, they think "oh, it must be HTML5", even if it's completely unrelated to the problem. It's hard to get around people's prejudice of web technology.