Okay so I decided to finally post this here after about 2 years of stress over this issue. Everytime I have to play maps with 1/8 sliders or maps that many sliders at the screen at the same time, my osu! simply starts lagging, making me miss very often. It's not a 'big' freeze, it's just like getting to 20fps or so (even though the counter doesn't change, still stays at 300-400fps. Changing the fps limiter to 60fps causes extreme input delay, 120fps as well. By the way, I probably did post this on the 'lag' thread, but nothing useful really happened since then. Also, playing with OpenGL or windowed mode fixes this issue, however the game overall plays pretty sloppy (windowed mode is related to Aero, I know).
Only reproducible on maps that have 1/8 sliderstreams or maps with fast sliders on DT, like:
http://osu.ppy.sh/s/1871 [Etna] (with DT)
http://osu.ppy.sh/s/55560 [grumd]
http://osu.ppy.sh/s/243 [Hard]
http://osu.ppy.sh/s/10143 [Love]
http://osu.ppy.sh/s/1391 [Hard]
Computer specs:
Only reproducible on maps that have 1/8 sliderstreams or maps with fast sliders on DT, like:
http://osu.ppy.sh/s/1871 [Etna] (with DT)
http://osu.ppy.sh/s/55560 [grumd]
http://osu.ppy.sh/s/243 [Hard]
http://osu.ppy.sh/s/10143 [Love]
http://osu.ppy.sh/s/1391 [Hard]
Computer specs: