You mean why is it better than Supermium? For me, it seems to bench better (in XP), and seems to drop fewer frames in YT. "Seems" because haven't tested extensively + not sure if anyone other than myself experiences Supermium in XP dropping frames.
BTW, win32 knows the author [or maybe just his work] & refers people to him: https://github.com/win32ss/supermium/issues/1183#issuecomment-2688498965
Not endorsing the browser, but am using it with XP & not seeing any drawbacks (other than it's not the devil we know).