01.Introduction: The Low Poly Charm (and Hidden Weight)
Lethal Company uses a deliberate retro aesthetic, internally rendering at low resolutions (around 512x512) before applying upscaling filters. Theoretically, it should run on practically any computer.
However, the game is built on Unity and relies heavily on the CPU for physics and network synchronization (netcode). When you add mods—especially those that increase player counts (MoreCompany) or add cosmetic items (Suits, Skins)—the CPU load grows exponentially.
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02.Chapter 1: The Performance Triad (Essential Mods)
To mitigate the weight of cosmetic mods, you need optimization mods that work at the rendering and memory levels. Don't play modded without these three:
1. HDLethalCompany (Graphical Optimization)
Despite the name suggesting "better graphics," it's actually the best performance tool. It allows you to control internal resolution, fog, and post-processing.
- Potato Configuration: Set 'Resolution Scale' to 1.000 (Native) or lower, and turn off 'Post Processing'.
- Visibility Configuration: It removes volumetric fog which consumes a lot of GPU resources on moons like March and Vow.
2. CullFactory (The FPS Savior)
Lethal Company natively renders things you aren't seeing (behind walls). CullFactory implements an aggressive "Occlusion Culling" system.
- Impact: Increases FPS by up to 40% inside the Factory/Mansion.
- Configuration: Install it and leave it on default (
portal-occlusion).
3. FixPluginTypesSerialization (Technical)
A technical mod that optimizes loading times and reduces RAM usage by fixing how BepInEx handles type serialization. Essential for modpacks with over 50 mods.
03.Chapter 2: Lobby Management (MoreCompany vs BiggerLobby)
There are two main mods for increasing lobby size. Your choice significantly impacts performance:
- MoreCompany: The most stable and visually polished option (includes cosmetics). Recommended for up to 8-12 players; beyond that, cosmetics become heavy.
- BiggerLobby: Older, with fewer visual features, slightly lighter for massive lobbies (20+ people) but more prone to desync bugs.
Pro Tip: If the host has a weak PC or poor internet, the game will lag for EVERYONE (teleporting monsters, etc.). The Host should always be the one with the strongest CPU (Single Core) and highest upload speed.
A1.Chapter 3: Lag Diagnosis (FPS vs Network)
It's crucial to distinguish between low FPS and Network Lag.
Low FPS Symptoms
- "Frame-by-frame" or slow-moving imagery.
- Heavier mouse feel.
- Happens when looking at many lights or lots of smoke.
- Solution: Lower resolution, remove visual mods.
Network Lag Symptoms
- Monsters kill you from a distance.
- Items take time to be picked up (loading circle appearing).
- Friends' voices are cutting out ("robotic").
- Solution: Improve host, close Discord, use a LAN cable.
A2.Chapter 4: Configuring R2Modman Correctly
Many errors stem from manual installations. R2Modman virtualizes folders to avoid clutter.
- Clean Profiles: Always create a new profile for each modpack. Mixing mods from different versions can cause the "Black Screen" on startup.
- Update All: Be careful with "Update All." Sometimes a mod updates and breaks compatibility with
LethalCompanyVariablesor other core mods. Check the changelogs. - Launch Arguments: In "Settings" > "Set launch options," you can skip the Unity intro and force exclusive mode for lower input lag.
A3.Chapter 5: Common Issues and Solutions (Troubleshooting)
Usually caused by sound mods (.custom sounds) or mods incompatible with game versions v50/v55/v60. Disable half your mods and test using the "Binary Search" method.
Differing BepInEx versions or mod configs. Use "Export Profile as Code" and ensure everyone is using EXACTLY the same code.
The game in "Borderless" mode sometimes fails to lock the mouse. Install the CursorLock mod or press Alt+Enter to force true Fullscreen.
Chapter 6: Skinwalker Mod (The SSD's Enemy)
The Skinwalker mod, which records your friends' voices for monsters to repeat, is brilliant but heavy.
It recording audio to the disk constantly. If installed on a mechanical HDD, it will cause stutters every time a monster tries to "talk."
Solution: Move your R2Modman profile to an SSD or disable the mod if you have limited disk space.
Chapter 7: Flashlights and Dynamic Shadows
In-game flashlights project dynamic shadows in real-time. Each active flashlight multiplies the rendering cost.
If 4 players use "Pro" flashlights in a tight corridor, FPS can be cut in half.
Pro Tip: Turn off flashlights when not needed. It saves both battery and frames.
Don't do it Manually.
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Written by a verified expert
Douglas Felipe M. Gonçalves
Expert in Windows system optimization with years of experience in hardware diagnostics, kernel tuning, and advanced technical support. Founder of Voltris and developer of the Voltris Optimizer.
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