Game so sloooooow

Hello !

I am making the tutorials on the SDK the fish game tutorial and fish demo also, however they are so slow after i add the background images (the rocks). Before i add the backgrounds, the game is not so slow, neither smooth, but we can say it is so so. Anyway if i build it, it is slow again. So, no matter if i am inside the level builder or running it as EXE.

One thing i have notice is that if i run the Adventure kit demo, if i use the OpenGL driver the game is very slow also, but if i use the D3D (DirectX) driver it is not so slow.

So, in the level builder, inside the preferences window i tell it to use the D3D driver, but in the console.log file, it is written that anyway it is using the OpenGL driver.
-------------------------------------------
Activating the OpenGL display device...
Setting screen mode to 800x600x32 (w)...
--------------------------------------------

I also tried to modificate the preferences/defaultPrefs.cs, i the section that says:
---------------------------------------------
$pref::Video::displayDevice = "OpenGL";
$pref::Video::preferOpenGL = 1;
---------------------------------------------

i wrote instead:
--------------------------------------------
$pref::Video::displayDevice = "D3D";
$pref::Video::preferOpenGL = 0;
---------------------------------------------
but the window game appears completely black.

So, seen this i undo this changes, i came back to OpenGL.

Any help will be appreciated,
thank you very much:

Mariano Burgos.