im aware of the crashing on Map 3, to be real all my beta testers and myself didnt run into any crashes. However when I released it, that's when I got people saying there's crashes. Wokgui is right tho, a lot of PC's and laptops are not are not strong enough to run certain campaigns, and your ingame settings, mods, and what your playing l4d2 on can effect whether it crashes or not.

As far as the question tho? "Why don't you fix it, Honest?" great question!

The answer is I have no idea what is causing the crashing on lower end machines. I seriously have no idea what causes the crashing, it could be a random room in the map that causing issues, all the way to a single brush that's not detected by the engine, the problem is the Source Engine doesn't tell you "Hey fix this its crashing because of this" It just crashes that's all.
The map is optimized, in fact its more optimized then the previous updates LOL that's how the lighting is HDR lighting. But the sacrifice of having HDR Lighting is its more unstable, and lot of maps have similar problems with this throughout L4D2. And l4d2 is based on the source engine which is a two decade old engine that is easy to break.

So I personally don't think the issue is fixable on my end because I have no idea what is causing it or how to fix it, so it just is what it is. I recommend turning off mods like other people have stated.

But yea I don't know how the crashing is occurring for those who are experiencing that, it could be a random prop in the map that's undetected to the source engine. It literally could be anything, the engine doesn't tell you why unfortunately. So the "Just fix it" argument is literally not possible when I have no idea what to fix.

In fact if people want to take a stab at fixing it yourself! Be my guess and I'll include the fix in a future update. But I attempted fixing the crash for multiple days straight and it was just not a good use of my time.

-cheers

for those who enjoy the update tho, thank you