as a post-sber myself (SB maker of 1 and 2 Just as a reference xD), i can give you some tips on reducing load for sb
you tried to use sb/circle (which doesn't exist (atleast not in the folder))
your "thank.png" is faded out for entire time... and your "for playing.png" / "kawaii.png" is out of bound.
and your sb isnt very efficient (usages of black.png while you can just fade off the bg), so i fixed it for you: https://puu.sh/weUOV/98f099a71b.zip (make sure you back up your current files (osb & sb folder) , so that you can go back to it if you dont like it and those extra sprites.)
^ on top of that sb, you just need to add "thanks for playing owo" pictures on there thank you for fixing my storyboard! i am a HORRIBLE sb mapper xd
00:16:485 (2) - bend this so that it fits nicely with 00:17:576 (3) - and offers more flow bent it a tiny bit (wow that does flow)
00:26:849 (1,2) - not sure why these need vol boost since i dont see a reason for it.. i feel it does but i'll lower it to 40%
good. I like it. i'm not experienced with mapping normals so i'm glad you said that!
check AiMod (there is some distance things to perhaps fix) fixed
00:06:667 (4,5,1) - I do think you can make DS just enough big so that objects dont touch. Its just things that drives me nuts i feel this is fine however it does make me a little insane too, but in this case i think i'll keep it unless few more mods ask about this
00:08:303 (1,2,3) - ^ yeah it doesn't look very nice. hope you fix it! (╯°□°）╯︵ ┻━┻ okay i tried to fix it
00:35:576 (4,5) - this should've been switched around circle-> slider feels better, ending on downbeat with sliderend seems odd i don't see a need to fix it though, i feel it still goes with rhythm
00:40:485 (2,3) - ^ fixed
00:52:485 (1) - have the spinner start at 00:52:212 so that players have just a bit more time to spin (you did it on normal actually) fixed
hope that helps. if you need help with sb or questions in general, just ask me okay, thanks!