Thank you so much for the kind words and the detailed feedback! I'm glad it works well on your RX 6800 XT at 1440p.

About newer FSR versions: I looked into it carefully, but unfortunately they can't be applied to browser video. FSR 2, 3 and 4 are temporal upscalers: they rebuild detail by combining several frames using motion vectors and depth information that a game engine provides for every frame. A video only contains the final image, so that data simply isn't there. FSR 4 also relies on dedicated hardware on RDNA 4 GPUs, which isn't accessible from a browser. FSR 1 is the only version that works on a single image, which is why Sharpview uses it.

That said, I'm working on adding more upscalers. Version 1.4.0 adds an Anime4K quality for anime and cartoons: it cleans up compression artifacts and redraws the lines at a higher resolution (it needs a capable GPU, and your 6800 XT will handle it easily). You can select it from the popup or with Alt+Shift+G. More options may follow in future updates.

Thanks again for the support!