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opengl version of qt makes animated qtquick2 application excessive ...

When using OpenGL version of Qt(not ANGLE version), as long as the application has lasting animations or particle systems, it used 25% cpu on my machine. (one core)

Both Windows XP and Windows 7 has this problem.

tested Qt versions:

1. 5.1.0 alpha, built with -opengl desktop


2. a dev branch checked out at March 23th, built with -opengl desktop


3. 5.0.2 (downloaded at 2013-03-21-461, from http://download.qt-project.org/snapshots/qt/5.0/5.0.2/ , but it’s not there now) opengl version

A simple animation with ‘loops: Animation.Infinite’ reproduces the issue.

When I use ANGLE version of Qt (5.0.1), the simple animation uses cpu 0%.

I’m building 5.1.0 alpha without the option ‘-opengl desktop’ (i.e. ANGLE version). will post the result hours later.