final transform = projection_from_viewer_to_screen * zoom * rotation * fit_mode_transform * source_to_viewer_alignment
However, "better" is subjective if your hardware isn't up to the task. Viewerframe Mode requires a modern GPU with dedicated VRAM to shine. On older integrated graphics chips, the mode can occasionally cause stuttering as the system tries to keep up with the aggressive synchronization demands. But for anyone using mid-to-high-tier hardware, the trade-off is almost always worth it. viewerframe mode better