General Performance Tips
You can follow a few general guidelines to increase the performance of your application.
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Only clear when you must.
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Minimize state changes.
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Use perspective correction only if you must.
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If you can use smaller textures, do so.
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Gracefully degrade special effects that require a disproportionate share of system resources.
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Constantly test your application's performance.
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Ensure that your application runs well both with hardware acceleration and software emulation.