How to Fix IRON NEST Heavy Turret Simulator Stuck on Loading Screen

When I first launched IRON NEST Heavy Turret Simulator, I expected to spend my evening calibrating artillery and leveling enemy fortifications—not staring at a loading screen that refused to move.

If you’re here, chances are you’re dealing with the same problem. Maybe the loading bar reaches 100% and freezes forever. Maybe Steam briefly shows the game as running before it suddenly closes. Or perhaps the game never makes it past the initial splash screen.

The good news is that, after testing multiple fixes and reading through player discussions, I found several solutions that consistently solve the issue for most systems. Since IRON NEST Heavy Turret Simulator is built around advanced physics, large environments, and detailed simulation mechanics, it can be surprisingly sensitive to Windows settings, drivers, and even connected USB devices.

This guide covers the fixes that are genuinely worth trying without wasting hours reinstalling Windows or randomly deleting files.

Why Does IRON NEST Freeze During Loading?

Unlike many arcade shooters, IRON NEST performs a significant amount of initialization before gameplay even begins.

During startup, the game prepares:

• Terrain destruction systems
• Ballistic physics calculations
• Shader compilation
• Texture streaming
• Memory allocation
• Controller detection

If any of these stages fail, the loading process may stop completely.

Some of the most common causes include:

In my experience, it usually isn’t just one problem. Two or three small issues often combine into one frustrating launch failure.

1. Try the Experimental Steam Branch First

This was the first thing I tested because developers frequently upload emergency fixes to testing branches before releasing them publicly.

If the game suddenly stopped working after an update, there’s a good chance the newer staging version already contains a fix.

How to Switch

1. Open Steam.
2. Right-click IRON NEST Heavy Turret Simulator.
3. Open Properties.
4. Select Betas.
5. Choose the available Staging or Playtest branch.
6. Wait for Steam to download the update.
7. Launch the game again.

This solution often resolves launch crashes caused by recently introduced bugs.

2. Disable Fullscreen Optimizations

Windows tries to help games by applying fullscreen optimization automatically.

Unfortunately, simulation games don’t always appreciate Windows “help.”

I’ve personally fixed several stubborn launch problems in other PC simulations simply by disabling this feature.

Steps

1. Open the game’s installation folder through Steam.
2. Locate the main executable.
3. Right-click it.
4. Choose Properties.
5. Open the Compatibility tab.
6. Enable Disable fullscreen optimizations.
7. Save the changes.

It only takes a minute, and it’s one of the easiest fixes to test.

3. Give Windows More Virtual Memory

One thing I noticed is that IRON NEST can consume a surprising amount of RAM while loading maps.

If your system already has browsers, Discord, recording software, or other applications open, Windows may simply run out of available memory.

Instead of crashing outright, the game sometimes sits on the loading screen forever.

Recommended Paging File Values

To change it:

1. Press Windows + R.
2. Type sysdm.cpl.
3. Open Performance Settings.
4. Navigate to the Advanced tab.
5. Open Virtual Memory.
6. Disable automatic management.
7. Enter the recommended values.
8. Restart your PC.

Even if you already have 16 GB or 32 GB of RAM, increasing virtual memory can still help with demanding simulation games.

4. Disconnect Extra USB Devices

This one surprised me.

Some games attempt to initialize every connected controller during startup.

If you have racing wheels, HOTAS flight sticks, steering pedals, extra controllers, or unusual USB hardware connected, the engine may become stuck while trying to identify everything.

Before launching:

• Disconnect unnecessary USB gaming devices.
• Leave only your keyboard and mouse connected.
• Reconnect controllers after confirming the game launches.

If you’re playing with a controller, also check Steam Input.

Steam Input Recommendations

Keyboard and Mouse

Disable Steam Input.

Controller Players

Enable Steam Input so Steam handles the controller profile consistently.

It’s a simple adjustment, but several players have reported that it solved endless startup loops.

5. Force Your GPU to Stay at Full Performance

Modern graphics drivers often lower GPU clock speeds while they think a game is “idle.”

The problem is that heavy loading screens don’t always look demanding to the driver, even though the game is preparing huge amounts of data.

That can occasionally cause freezes during initialization.

For Nvidia Users

1. Open Nvidia Control Panel.
2. Navigate to Manage 3D Settings → Program Settings.
3. Select IRON NEST Heavy Turret Simulator.
4. Locate Power Management Mode.
5. Change it to Prefer Maximum Performance.

For AMD Users

1. Open AMD Software Adrenalin.
2. Go to the Gaming section.
3. Select the game’s profile.
4. Choose a higher performance preset instead of balanced mode.

This won’t magically increase FPS, but it can improve startup stability.

6. Verify the Game Files

Whenever Steam installs an update, there’s always a small chance that one or two files don’t download correctly.

That single damaged file can stop the entire game from loading.

Fortunately, Steam makes verification easy.

Verification Steps

1. Open Steam Library.
2. Right-click the game.
3. Select Properties.
4. Open the Installed Files tab.
5. Click Verify integrity of game files.
6. Wait until the scan finishes.

Steam automatically downloads anything that’s missing or corrupted.

It’s worth doing before attempting a full reinstall.

A Few Extra Things I’d Recommend

These aren’t guaranteed fixes, but they’ve helped me with plenty of demanding PC games over the years.

Close unnecessary background applications.

Programs that inject overlays or consume RAM can interfere with startup.

Examples include:

• Recording software
• Hardware monitoring utilities
• RGB control software
• Browser tabs using lots of memory

Update your graphics driver.

Even if your driver isn’t ancient, installing the newest stable version can eliminate shader compilation issues introduced by newer game engines.

Install the game on an SSD.

IRON NEST streams large amounts of data while loading. Running the game from an SSD noticeably reduces loading time and may prevent timeout-related freezes.

Restart after major Windows updates.

Windows sometimes leaves graphics components waiting for a reboot. A simple restart can solve surprisingly stubborn launch problems.

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Quick Troubleshooting Checklist

If you’re in a hurry, work through these in order:

1. Verify game files.
2. Switch to the newest staging or beta branch.
3. Disable fullscreen optimizations.
4. Disconnect extra USB controllers.
5. Increase virtual memory.
6. Set your GPU to maximum performance.
7. Update graphics drivers.
8. Restart the computer and launch the game again.

This order covers the most common causes without requiring complicated troubleshooting.

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Final Thoughts

Simulation games like IRON NEST Heavy Turret Simulator push hardware differently than typical shooters. Instead of loading a simple multiplayer map, the game prepares complex destruction systems, projectile physics, environmental calculations, and numerous background processes before you even reach the main gameplay.

That also means startup problems are often caused by relatively small conflicts—Windows display settings, corrupted Steam files, aggressive power-saving features, or even a forgotten USB controller plugged into the back of your PC.

Personally, the combination that solved the issue for me was switching to the latest testing branch, verifying the installation, and disabling fullscreen optimizations. After that, the loading screen completed normally, and the game launched without any further problems.

If you’re still stuck after trying everything above, keep an eye on future patches from the developers. Launch-week builds for complex simulation games tend to receive frequent stability updates, and many loading issues disappear after the first few hotfixes. Until then, the fixes in this guide give you the best chance of getting back into the turret instead of staring at an endless loading screen.

IRON NEST: Heavy Turret Simulator | Worth Your Time and Money | (Overview)