Transport Fever 3 Performance & Troubleshooting — Low FPS, Stuttering, Crashes & VRAM

Quick answer: Low FPS is usually GPU-bound if it happens while the game is paused, and CPU-bound if it only shows up when you raise the simulation speed. Work out which one you have first — lower resolution and shadow/texture settings for a GPU limit, or simplify the map and mods for a CPU limit. Build 40415, now on the Steam preview branch, is the first official batch of stability and performance fixes (camera, layer views, VRAM), but it is a preview build, not Stable.

Current build status

Build	Status
Stable (launch)	The September 29, 2026 launch build — what every Steam player is on unless they opt in
Preview / Public Testing	Build 40415 — the first set of stability and performance fixes, on the Steam "preview" beta branch
Last verified	2026-10-02

Build 40415 is not yet pushed to Stable. If you haven't joined the preview branch, you're still on the launch build, and none of the 40415 changes below apply to you yet.

What build 40415 changes

Urban Games developer UG-Sam confirmed build 40415 is on the Steam preview branch as "the first set of stability and performance improvements as well as other fixes." The official release notes confirm these performance items (PREVIEW_RELEASE_NOTE):

Camera movement rendering performance — improved
Layer views — rendering performance improved while layer views are active
Video memory (VRAM) usage — improved under certain conditions
Multiple crash / error fixes — see the specific release-note entries; this does not mean "all crashes are fixed"

Read "what 40415 targets" literally. It targets specific rendering paths and a set of named crash/error fixes — it is not a blanket performance guarantee.

Low FPS

The first question is when the FPS is low, because it points at a different bottleneck (OFFICIAL):

Symptom	Most likely bottleneck
Frame rate low even while paused	GPU-bound
Raising game speed barely speeds up the simulation	CPU-bound

If you haven't joined the preview branch, the launch build is what you're seeing — 40415's camera/layer/VRAM improvements don't apply to you yet.

GPU bottleneck

SYMPTOM → CAUSE → CHECK → FIX

Symptom: low FPS that doesn't improve when you pause the game
Cause: the graphics card is the limit — resolution and quality settings cost too much
Check: watch GPU usage; a GPU pinned near full load while paused is the tell
Fix (OFFICIAL): lower resolution (1920×1080 instead of 4K is the single biggest lever), then anti-aliasing, shadow quality, texture quality, and LOD. On a dual-GPU laptop, confirm the game is using the dedicated GPU, not integrated graphics

CPU / slow simulation

SYMPTOM → CAUSE → CHECK → FIX

Symptom: the game runs but raising speed to 2× or 4× barely makes the simulation faster
Cause: the simulation itself is CPU-bound — lots of vehicles, cities, industries, connections and mods all add load
Check: watch one CPU core; a single core pinned while the GPU idles is the tell
Fix (OFFICIAL): graphics settings barely help here. Reduce the workload — smaller/fewer cities, simpler networks, fewer vehicles, fewer industry and cargo connections, and fewer or lighter mods. Large maps, dense road/rail networks and complex traffic all hit the simulation hardest

When your CPU and GPU both clear the minimum spec but FPS is still low, check the other usual suspects (OFFICIAL): background apps, not enough RAM, limited VRAM, thermal throttling, power-saving settings (laptops), outdated drivers, high resolution, and demanding mods with oversized textures or complex models.

Stuttering

Scrolling / panning stutter in larger cities: PLAYER_REPORTED — some preview users say the worst scrolling stutter in bigger cities is mostly gone on 40415. Treat it as an early report, not a guarantee.
Stutter in general traces back to the same split as FPS: frame-pacing (GPU) versus simulation hitches when lots of systems update (CPU). Use the GPU/CPU checks above to decide which settings to touch.

Layer / HUD-related reports

Official: 40415 includes rendering performance improvements specifically while layer views are active (PREVIEW_RELEASE_NOTE).
Player reports: some preview users say layer and HUD interactions feel more stable (PLAYER_REPORTED). Keep this separate from the official layer-view fix — the official change covers rendering while layer views are active; the "feels more stable" impression is player-reported.

VRAM

Symptom: VRAM near capacity
Fix (OFFICIAL): lower texture quality first, then check overall GPU / RAM / VRAM usage
40415 note: the preview build improves video memory usage under certain conditions (PREVIEW_RELEASE_NOTE) — not a universal VRAM reduction

Black screen / startup

These come from the official Common Issues list (OFFICIAL):

Black screen after changing graphics settings → press Alt+Enter to toggle fullscreen/windowed, then pick a resolution and display mode your monitor supports. If that doesn't recover, restart and reset the graphics settings.
Black screen on startup / freeze → update the GPU driver; on a dual-GPU system confirm the game uses the dedicated GPU (Windows Settings → System → Display → Graphics, or the NVIDIA/AMD control panel).
Game won't start or crashes while loading (even without mods) → check the minimum spec, update drivers and OS, verify game files, remove conflicting mods, and disable overlays / monitoring / security software. Official guidance: "When troubleshooting startup problems, first try starting the game without mods."
Window invisible (icon in taskbar only) → it may be on another display or off-screen; Win+Shift+←/→ to move it, or Alt+Enter to window it.
Linux won't start → 64-bit Linux only; verify files, update the system and drivers, disable mods, and launch from a terminal to see the missing-library error. (Do not manually copy libstdc++ as older TF2 guides suggest.)
Mouse pointer invisible → Alt+Enter, adjust the mouse cursor option, and check overlays / remote-desktop software.

Crashes

What 40415 changes: multiple named crash / error fixes (PREVIEW_RELEASE_NOTE). Do not read this as "crashes are gone."
Player reports: some preview users say freezes and crashes "seem solved" on 40415 (PLAYER_REPORTED) — a single-player impression, not a universal fix.
Still being reported: Mission 7 and Linux Mod Hub crashes are still reported by some preview users (PLAYER_REPORTED) — see the section below.

Mods & performance

Mods add load to the CPU simulation, not just the GPU. Heavy or many mods, and mods with oversized textures or complex models, are called out in the official performance guidance (OFFICIAL).
40415 contains some mod-related fixes (PREVIEW_RELEASE_NOTE).

Issues still reported on 40415

Preview is a test branch, not a finished patch. Two problems are still being reported by some preview users (PLAYER_REPORTED):

Mission 7 — still reported by some players
Linux Mod Hub crashes — still reported by some preview users

These are player-reported and should be read as "not yet confirmed fixed," not as official bug status.

How to join the preview branch

Steam Library → right-click Transport Fever 3 → Properties
Go to Game Versions & Betas
Select the preview branch from the dropdown
Steam downloads the preview build; you can switch back to the default branch the same way

Per developer and community guidance, switching branches is savegame-safe.

Quick diagnostic checklist

Low FPS while paused → GPU bound → lower resolution / AA / shadows / textures / LOD
2× / 4× speed barely faster → CPU bound → simplify map, vehicles, industries, connections, mods
VRAM near full → lower texture quality
GPU pinned + CPU idle → GPU bound
Single core pinned + GPU idle → simulation bound (graphics settings won't help)
Black screen after graphics change → Alt+Enter
Won't start → verify files, update drivers, disable mods, disable overlays
On a laptop and slower than expected → check thermal throttling and power-saving mode

Official sources / verification

Data point	Status	Source	Last verified
Build 40415 on Steam preview branch	Developer confirmed	Steam developer thread	2026-10-02
Camera / layer-view / VRAM rendering improvements	Preview release note	Official release notes	2026-10-02
Low FPS while paused = GPU-bound	Official	Official Known Issues	2026-10-02
2×/4× speed = CPU-bound	Official	Official Known Issues	2026-10-02
VRAM near capacity → lower textures	Official	Official Known Issues	2026-10-02
Black screen / startup / Linux checklists	Official	Official Known Issues	2026-10-02
+20–30 FPS, lower CPU usage	Player reported	Preview feedback thread	2026-10-02
4K "drastically improved" (RTX 5090)	Player reported (single case)	Preview feedback thread	2026-10-02
Scrolling stutter mostly gone	Player reported (early)	Preview feedback thread	2026-10-02
Mission 7 / Linux Mod Hub still reported	Player reported	Preview feedback thread	2026-10-02

Related: System Requirements · FAQ · Mods