Sebastien Lorber created CB-9346:
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Summary: Cordova index.html doctype has huge Android performance
impact
Key: CB-9346
URL: https://issues.apache.org/jira/browse/CB-9346
Project: Apache Cordova
Issue Type: Bug
Components: Android
Affects Versions: 4.0.0
Environment: Nexus4 (4.4.3), SKD22, minTarget=16, target=22, Ubuntu
12.04, cordova-cli=5.1.1
Reporter: Sebastien Lorber
Hi,
This is another case were the exact same app, running on the same device, is
slower in webview than in mobile browser.
In my company we have a mobile website, that runs fine in mobile web browser.
We started to port it to a cordova/phonegap application so that is runs in
webview and is available in Android/iOS stores.
So I'm trying to run for some days the app in a Cordova shell. It works, but is
really is a lot slower than using the mobile browser.
As far as I know, I run 4.4.3 version of Android so it's supposed to use new
Chromium-based webviews that are faster than former android webviews.
According to readings on the internet, I tried many things, including changing
the hardwareAccelerated true/false, updating the min/target SDK, or even using
the Crosswalk plugin. None of these had a significant effect.
Also I noticed some little CSS bugs in the Cordova version compared to the
mobile version, like a scrollable container that did not have the appropriate
height... I finally figured out that we were using `<!DOCTYPE html>` on the
Cordova index.html while we were not in the html served for mobile browsers.
So I tried to remove the <!DOCTYPE html> from the index.html of Cordova,
primarily to fix the CSS bug
(http://stackoverflow.com/questions/1966300/height-100-is-not-working-in-html-when-using-doctype-how-i-can-fix-this)
After removing the doctype, it solved the CSS bug, but also solved the
performance issue!
Can someone explain why this doctype has any impact on performances? Is it a
Cordova bug?
I can notice that the doctype is included in all Phonegap examples I've seen so
far. Is it really required? And what can be the impact of removing this doctype?
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