Requiem: power station lag

[passiw]

Hello,

in Penumbra: Requiem at level 06 (power station) I shall move the blue glowing ball through the blue lasers on the ground. But the level is lagging very bad, especially when I get close to those lasers. I tried for hours, but there's n way to get past that point with the ball.
Could someone maybe upload a savegame after that point? That would be great.

Cheers, Pascal