Hello all. I came here hoping there would be a sub-forum dedicated to lighting/lightmaps and memory issues, but apparently not, so I'm posting here in hopes someone has the time and kindness to help with some issues I've come across since updating computers: Quick summary of my issue: I've recently upgraded computer and I see benefits in Unity of course and I can run recent PC games on Ultra quality, but after tweaking lighting settings I get memory errors I didn't get with the old one. The old PC is 9 years old: Windows 7 Home, 64 bit Intel i5 dual core (I don't have the exact model in front of me) 12 GB RAM DDR3 Plenty of HDD storage Radeon 5700 with 1 GB RAM. My Unity project is an out-door only architectural scene which I am able to run decently enough (at medium quality, without post-processing stack) on that old system as well as bake the lighting on semi low settings if I leave it calculating overnight. It never gave me out of memory errors. I even once generated the lightmaps on a 2011 MacBook Pro with 16gb RAM, running MacOS Sierra. Took all night but no memory errors. Now my new system is a "gaming" system built by a reputable local shop: Windows 10 Home, 64 bit Intel i7 8700k, liquid cooled 16 GB RAM DDR4 @ 2400 Mhz NVidia GTX 1060 6GB SSD storage with > 100GB free HDD with over 1 TB free The project previously used Unity 2017.3.x Currently using Unity 2017.4.17f1 I went through my lighting and bumped up settings so I could bump this project up to a quality this new system is capable of (keeping in mind, this isn't even a 2080 or 9700k based system. My expectations are not THAT high). Nevertheless I get errors in Unity like: Clustering job failed for system: 0x5972f736d56150cacefa496f46b93761, error: 4 - 'Out of memory loading input data.'. Please close applications to free memory, optimize the scene, increase the size of the pagefile or use a system with more memory. Total memory (physical and paged): 42710MB. If I check memory through Task Manager, it says there's an average of 6 to 8 GB of ram still FREE!! Why is Unity claiming there is not enough memory? Basically, I left Unity calculating overnight on this faster system and it has still stalled with tons of errors when I checked on it this morning. I looked in lighting for the lightmaps and NONE exist. Here are my current settings. I don't believe them to be egregiously high, but maybe there is a setting I have misconfigured due to ignorance: TLDR; Getting memory errors on new PC that's way better than old 9 year old PC. Please review my lighting settings and advise where I may be going wrong. And YES I have been reading the following resources: https://docs.unity3d.com/2018.2/Documentation/Manual/BestPracticeLightingPipelines.html Outdated info: https://unity3d.com/learn/tutorials...uction-precomputed-realtime-gi?playlist=17102 (Couple others...) YES I have tried increasing my pagefile size. NO I have not changed the Unity GI cache sizes, they are at the default. YES I have lowered the lighting settings from what they were when I first encountered these issues. NO I have not yet tried going back to 2017.3.0f, nor have I tried reverting all settings to what they were with the old PC. Thank you !