Android :: OpenGL ES Simple Tile Generator Performance

Thank to previous replies, and with a major inspiration from http://insanitydesign.com/wp/projects/nehe-android-ports/ , i started to build a simple Tile Generator for my simple 2D zelda-like game project.I can now generate a map with the same textured tile, using 2 for(..) imbricated iterations to draw horizontal and vertical tiles, and got some basic DPAD key input listeners to scroll over the x and y axis.but now im running into my first performance problems, just with one texture and one model.When trying to build a 10x10 map, scrolling is fine and smooth.When trying with 50x50, things get worse, and with a 100x100, its way unacceptable.Is there a way only to tell OpenGL to render the 'visible' part of my mapset and ignore the hidden tiles? im a totally new to this.