I never understood the point of light performance modes in phones.No the Light Performance profile.
Let's make your phone perform like a chipset from 2 or 3 years ago to save battery life. Kind of negates the point of having a fast or flagship level phone at that point.
I shouldn't have to compromise everyday performance just to get adequate battery life. Governers on most modern phones and AI should be enough to regulate performance and battery life and if it isn't then Samsung is doing something wrong.
Most people now expect at least a full day of battery life and most want 2 day battery life and would probably want more.
Most larger flagship phones with one exception have large enough batteries to deliver most people's expectations without having to tinker with performance settings. In my opinion if I have to adjust the performance settings then something is wrong.
There are cases, generally in laptops/desktops where more refined control for specific use cases is required. Smartphones generally don't need such fine tuning. I can see using a battery saver governer in times of emergency when you don't have much battery left and won't be able to recharge or other such situations. Otherwise standard performance or high performance if I could choose it. But again if I need a high performance mode it is sort of the same as needing a low performance mode.
It is hard to believe that with a s25 ultra and a 5000mah cell you aren't getting good battery life with a more powerful and more efficient chip than previous generation.
Usually when odd battery drain occurs it is either a bad app or a bad update/corrupted installation. It can also be the cache. Most of the time and simple back up and reset will fix unless the bad app is reinstalled or another corruption occurs. Play store updates may also slightly affect battery.