Anyone know how to fix lagginess?

[Mounce]

Do you have any background tasks?
Penumbra has bit more after-effects than halflife does, so you can't expect the same performance.
Also, penumbras physics are alot more complex than half lifes.

Even half-life 2? like in Penumbra Overture you can easily see or assume that it doesnt have as great physics as you can't even flip the objects and they all seem to have a specified 'weighted-bottom' so they rarely flip and wont roll or react realistically to the law of gravity and momentum or etc

throw a box and it will stay stay perfectly on the same side and nor whirl around etc, is what I mean, same with a rock. (I know in 2nd, Black Plague, its then a different story and you CAN flip things, but not overture)

So how can its physics be more stressful?

I can understand course if its superior to half-life 1 but half-life 2? With the gravity gun and etc, doesnt seem likely :\ unless I can be proven wrong.

and no, I made sure all background processes were all off