JAVA 2D Game Linux terrible FameRate

I’m developing a 2D game in java. Our group is normally developing on a Windows and Mac platform. No problems appear during the game and we have a constant frame rate of 60 fps.

Yesterday we ran our game on a Linux computer and the frame rate was only about 10 frames per second!

Does anybody have heard something like this? Having problems on running Java games on Linux? Holding up a good frame rate on Linux?

I don´t know which code lines(at the moment more then 12000) I should show you, so you could understand my problem. But I’ll try to explain a little of our concept so maybe you know a solution or you can give us a hint :)

We build a Content Manager Service, which loads and holds our images which should be drawn on the JFrame. Typically we are using images in a png format.

A very short extract:

//Load our images which are later drawn on the Frame
URL url = this.getClass().getClassLoader().getResource( the right image Path);
this.image = ImageIO.read(url);

//extract of draw
this.graphicsDevice.getGraphics().drawImage(ourImage, x , y , null);

We have about 25 different images at the same time, which are directly drawn on the graphic device of the JFrame.

I don´t have any experience with Linux, that’s why I can´t understand the source of the terrible frame rate. (Remember, on windows and mac pcs it´s constant 62 fps, with the same code :( )

If anybody needs some more information to help, I would try to add some.

Thanks for reading!

Best regards FireDragon

Solution

I would ask the user experiencing such problems which version of X, video card drivers and jre he is running and if compositing is on.

I experienced dramatic increase of RAM/CPU usage with the same application after updating to newer version of openjre.

I would try to test an application on AMD and nVidia machines, with proprietary and free drivers and with openjre and sunjre to have an idea what causes low fps.