> There's nothing more annoying to a mobile user than an "app" that takes 10 seconds to start up
Try this on your mobile browser http://hn.premii.com/
Now download this. Android : https://play.google.com/store/apps/details?id=com.premii.hn Or iOS: https://itunes.apple.com/us/app/hacker-news-yc/id713733435
And play with it. Download top 5 native HN apps, and launch those, and tell me which one takes 10 seconds on which device.
No doubt that you will have to deal with different version of webkit browsers (webview) on android. As long as you follow standards and not use latest CSS rules, you will be fine. And with Android 5.0+, its much much better.
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Now try this page on your mobile, and tell me how bad it is. This is few hours of work (Flipboard style animation), and works on iOS/Android Chrome/WP8: http://reddit.premii.com/#/r/news
There are issues with browsers, but performance is not one of the issue.
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It takes time on Cordova not because of HTML, but because how each platform works natively. I am not a native developer.