Qt 5.4 on BeagleBone Black EGLFS very slow

[luca]

Hi all,
I got sgx module for BBB following "this":http://elinux.org/BeagleBoardDebian .

Then I built Qt 5.4 and compiled a very simple QML application that show two fullscreen images fading between them.

The problem is that if I execute the application with:
@
./myapp -platform linuxfb
@
it run fine but if I run with:
@
./myapp -platform eglfs
@

It become very slow and the fading between images is very bad.

What should it be the problem?

Thanks

Luca