i use laptop integrated graphics, and for me the gpu usage (in windowed mode) was 75% in the first room and 55% in the tiny room above. i did notice a different when playing, so i think at least for me there is no problem here. i was able to get all the lives so it didn't seem to affect the gameplay in any way
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Thank you this is very helpful. It is reassuring that most people are well equipped. I'm currently testing the final Full HD resolution for Bobo 2 and have already designed tiles, sprites, lighting, weather effects, day and night cicle and backgrounds for it. It looks like the final graphics will consume 20-27% of my GPU so it would be less than 75% for you. I decided to use at most 2 shaders per room. One for water/fire and one for background effects. Everything else is not worth neglecting potential players.
And I am happy that you collected all lives :)