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Creating lots of small objects frequently can drastically decrease performance. This commit introduces three fixes which avoid this: - Use a preallocated palette and indexed-to-rgb destination Typed Array (the destination typed array is currently allocated at `4 * width * height`). - Inline `getTightCLength`, which returned a two-item array. - Pass RGBX data directly in a Typed Array to the Display, which avoids an extra loop, and only creates a new Typed Array View, instead of a whole new ArrayBuffer.