Warning W303 - 24-bit colour depth uses 3 bytes that is not a power of 2 number. 32-bit colour depth uses 4 bytes (64-bit) and can be accessed much faster resulting in a performance increase even though more video memory is used.
Fix: If your video adaptor supports it, always use 32-bit modes instead of 24-bit. Otherwise drop back to 16-bit colour.
For more information, please see the (FAQ).