| 1 | The main difference in quality comes up mostly with motion. I played around a fair bit with test videos to figure out how much it mattered, and the difference was basically that on veryfast, any and all motion (at least in ZK, not so much Achron) would cause brief artifacting, which ultimately meant the entire video felt blurry. With fast, there are still some artifacts, but only on really large movement. The artifacting from zooming and panning with the middle mouse button is minimal, rather than constant and noticeable. | 1 | The main difference in quality comes up mostly with motion. I played around a fair bit with test videos to figure out how much it mattered, and the difference was basically that on veryfast, any and all motion (at least in ZK, not so much Achron) would cause brief artifacting, which ultimately meant the entire video felt blurry. With fast, there are still some artifacts, but only on really large movement. The artifacting from zooming and panning with the middle mouse button is minimal, rather than constant and noticeable. | 
                
                    | 3 | That 
            being 
            said,
             
            I'm 
            only 
            doing 
            it 
            because 
            streaming 
            is 
            limited 
            by 
            both 
            the 
            streamer 
            and 
            the 
            viewer,
             
            so 
            it's 
            to 
            allow 
            me 
            to 
            stream 
            at 
            2250kbps 
            rather 
            than 
            3500kbps(
            Twitch 
            recommended 
            max)
             
            without 
            having 
            much 
            of 
            a 
            loss 
            in 
            quality.
             
            Ideally 
            I 
            could 
            stream 
            at 
            8000kbps(
            10mbps 
            upload)
             
            and 
            have 
            Twitch 
            handling 
            dynamically 
            downsampling,
             
            but 
            they 
            only 
            do 
            that 
            for 
            partner 
            channels. | 3 | That 
            being 
            said,
             
            I'm 
            only 
            doing 
            it 
            because 
            streaming 
            is 
            limited 
            by 
            both 
            the 
            streamer 
            and 
            the 
            viewer,
             
            so 
            it's 
            to 
            allow 
            me 
            to 
            stream 
            at 
            2250kbps 
            rather 
            than 
            3500kbps(
            Twitch 
            recommended 
            max)
             
            without 
            having 
            much 
            of 
            a 
            loss 
            in 
            quality.
             
            Ideally 
            I 
            could 
            stream 
            at 
            8000kbps(
            10mbps 
            upload)
             
            and 
            have 
            Twitch 
            handle 
            dynamically 
            downsampling,
             
            but 
            they 
            only 
            do 
            that 
            for 
            partner 
            channels. |