Grounded 2 Low FPS Fix: Base Lag, Stutter and Co-op Hitching

Grounded 2 runs at low FPS for two separate reasons: its Unreal Engine 5 lighting, which you control with Render Scale, the DLSS/FSR upscaler and the Quality preset, and the CPU load from large bases and late-game saves, which no graphics setting fully fixes. Lower Render Scale or turn on an upscaler first; if the frame rate only falls apart at your base, the fix is the base, not the menu.

This is one game in our survival and base-building series. The shared mechanism — why placed objects cost CPU time in every building game — is explained in why base building tanks FPS in survival games.

Find your problem first

What you see	Most likely cause	Go to
Low FPS everywhere, from the first minute	GPU load — Lumen lighting, resolution, Quality preset	Fix 1
Fine in the yard, slow at or near your base	Placed-object load on the CPU	Fix 2
Hitching when you travel between areas	World streaming and shader compilation	Fix 3
Smooth for the host, laggy for everyone who joins	Peer-to-peer co-op	Fix 4
Fine for an hour, then gradually worse	Long-session buildup	Why FPS drops after hours of gameplay

Why Grounded 2 is demanding

Grounded 2 entered Early Access on 29 July 2025 on Unreal Engine 5, co-developed by Obsidian Entertainment and Eidos-Montréal. Like most UE5 games it lights the world with Lumen, a real-time global illumination system that is expensive on the GPU — and the game’s menu doesn’t expose Lumen as its own toggle. It’s bundled into the Quality preset instead.

The December 2025 feature update moved the game to Unreal Engine 5.6.1 and added DLSS and FSR on PC. Obsidian reported a default FPS gain, less hitching when crossing the Park and better performance on large world saves. Patch 0.4.2 (June 2026) then shortened the player’s streaming range so less of the world loads at once and optimized performance around player bases — Obsidian’s own confirmation that bases are a real performance cost. If your settings date from launch, revisit them — the best options changed.

Fix 1 — The settings that actually move FPS

Grounded 2’s graphics menu is short. Only a few options matter for frame rate:

Setting	What it does	Recommendation
Upscaling (DLSS / FSR)	Renders below native resolution and upscales	Quality at 1080p–1440p, Balanced or Performance at 4K or on weak GPUs
Render Scale	Manual internal resolution	Leave at 100% when using DLSS/FSR; otherwise 75–85%
Quality	Preset covering lighting, shadows, foliage and effects	Drop one step at a time — this is where Lumen lives
Field of View	How much of the world is drawn	Very wide FOV draws more grass and objects; pull it back a little if you’re CPU-limited
Frame Rate Limit	Caps FPS	Cap a few frames under your refresh rate for steadier frame times
Motion Blur, Depth of Field, Chromatic Aberration	Post-processing	Personal preference — small cost, off for clarity

Pick DLSS on an RTX card and FSR on AMD, Intel Arc and GTX cards. Not sure which mode to use? DLSS Quality vs Balanced vs Performance and DLSS vs FSR vs XeSS explain the trade-offs.

Optional: turn off Lumen in Engine.ini. Players have widely used a config tweak to disable Lumen’s indirect lighting for a large GPU saving, at the cost of flatter, darker lighting. Close the game, press Win+R and open %LOCALAPPDATA%\Augusta\Saved\Config\Windows (Steam — Xbox and Game Pass use WinGDK). Back up Engine.ini (create it if it’s missing), then add:

[SystemSettings]
r.Lumen.DiffuseIndirect.Allow=0

This is a tweak, not a supported option — it can stop working or cause odd lighting after a patch. Delete the lines if anything looks wrong.

Fix 2 — Make your base cheaper to run

If FPS is fine out in the yard but drops when you get home, your base is the bottleneck. Every wall, floor, light, storage chest, defence and decoration is an object the game streams in and keeps updated, and a big base concentrates thousands of them in one place. That’s largely CPU work — it’s why lowering graphics helps less at your base than anywhere else, and why Obsidian targeted base performance directly in patch 0.4.2. Make sure you’re on the current version before rebuilding anything.

1. Build compact. Floors stacked vertically cost less than a sprawling single-storey footprint covering the same storage.
2. Consolidate storage. Fewer, larger chests beat dozens of small ones.
3. Demolish what you don’t use — abandoned outposts, test builds, extra walls and lights.
4. Be sparing with lights. Light sources add GPU cost on top of the object count, and a base lit like a stadium compounds both.
5. Restart after long sessions. If the base gets slower the longer you play, see why FPS drops after hours of gameplay.

The mechanism is the same in every building game — why base building tanks FPS in survival games explains it, and why a faster CPU helps here more than a faster GPU.

Fix 3 — Stutter and hitching

Short freezes while you travel are usually the world loading in, or shaders compiling for the first time — not low FPS.

1. Install the game on an SSD. Streaming a dense UE5 world from a hard drive causes hitches no setting can hide.
2. Let shaders finish. The first session after a patch or driver update stutters more while shaders compile; it usually settles. Shader compilation stutter explained covers why.
3. Update your GPU driver, and if hitching gets worse after an update, clear the shader cache.
4. Close overlays and monitoring tools while you test.

Fix 4 — Co-op lag for the players who join

Grounded 2 has no official dedicated servers. Co-op is peer-to-peer: the host’s game runs the world simulation and sends it to everyone else. That’s why the host often plays smoothly while the players who join see rubber-banding and hitching.

• Let the strongest PC with the best upload connection host. The host’s CPU carries the whole world, and their upload carries every other player.
• Use a wired connection on the host, not Wi-Fi.
• Keep the shared base lean (Fix 2) — the host simulates it for everyone.

If you play other survival games with a rented server, survival game server lag explains how to tell server lag from client lag.

Fix 5 — The Windows layer

Once the in-game settings are right, a few Windows basics keep frame pacing steady: use the High Performance or Ultimate Performance power plan, enable XMP or EXPO so your RAM runs at its rated speed (how to enable XMP or EXPO), and keep the GPU driver current. For smoother frame delivery underneath the game, the timer resolution guide covers the Windows scheduling layer.

The short version

1. Turn on DLSS or FSR (Quality) and leave Render Scale at 100%.
2. Drop the Quality preset one step — that’s where Lumen lives.
3. Slow only at your base → build compact, consolidate chests, remove unused structures.
4. Hitching while travelling → SSD, let shaders compile, update the driver.
5. Lag for co-op guests → best PC and connection hosts, wired.

More in the series: why base building tanks FPS · survival game server lag · why FPS drops after hours of gameplay · Satisfactory low FPS fix · Project Zomboid low FPS fix · Valheim low FPS fix