You can follow a few general guidelines to increase the performance of your application.
ˇOnly clear when you must.
ˇMinimize state changes.
ˇUse perspective correction only if you must.
ˇIf you can use smaller textures, do so.
ˇGracefully degrade special effects that require a disproportionate share of system resources.
ˇConstantly test your application's performance.
ˇEnsure that your application runs well both with hardware acceleration and software emulation.