Alpha blending is slower on linux

we are developing SWT / RCP application (Eclipse 3.5) for both Windows and Linux (on identical hardware). The app is a GIS application that displays multiple layered maps (PNG images) with alpha blending.

org.eclipse.draw2d.Graphics.setAlpha(...);
org.eclipse.draw2d.Graphics.drawImage(...);

      

The performance is pretty good on Windows, but very poor on Linux.

- Linux problem (GTK / KDE)? or is there a performance workaround for Linux?

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