1. Here's why

Some PCs have two graphics cards: a low perofrmance Intel or AMD onboard/integrated graphics chip and a faster NVIDIA or AMD graphics card. 

1. Make sure that you have got a compatible graphics card

1.1: Click here to find out if your PC has got an NVIDIA or AMD graphics card.

1.2: Click here to see how many PassMark points your graphics card has got.

• Lumion 10.0 and newer: If it has got at least the minimum required PassMark points and graphics card memory - and Lumion crashes or exhibits artifacts - it might be because the PC is using the slow Intel HD graphics chip in Lumion.
• Lumion 9.5 and older: If it has got at least 2,000 PassMark points and at least 2 GB memory - and Lumion crashes or exhibits artifacts - it might be because the PC is using the slow Intel HD graphics chip in Lumion.
  
  

2.  Check these important settings:

2.1:  Is Lumion open on the correct monitor?

It is very important that the Lumion window is only ever placed on the monitor that is connected to the fast NVIDIA/AMD graphics card.

This might occur where the PC (desktop or laptop) has separate video output sockets (1 for the Intel HD chip and 1 or more for the NVIDIA/AMD graphics card) and you connect these sockets to separate monitors.

If the Lumion window is running on the monitor that is connected to the Intel HD chip, you should move the window to the monitor that's connected to the fast NVIDIA/AMD graphics card, and quit and restart Lumion.

2.2:  Laptop
If it is a laptop PC, please also make sure that it is plugged into a power socket, rather than using the battery.

2.3: If the problem persists, quit Lumion and follow the instructions in the sections below.

3. NVIDIA graphics cards

3.1: Option A

1. Right-click on the desktop and choose NVIDIA Control Panel.
2. Manage 3D Settings -> Program Settings tab -> Add -> Locate Lumion.exe in the folder you installed Lumion in (usually in C:\Program Files\Lumion [Version])
3. Select the preferred graphics processor for this program -> High-performance NVIDIA processor and start Lumion again.
4. Repeat these steps for every Windows account that is in use on this PC.

3.2: Option B

1. Open the folder you installed Lumion in, for example, C:\Program Files\Lumion (Version).
2. Right-click on Lumion (or Lumion.exe).
3. The Windows menu should show the option 'Run with graphics processor'.
4. Select 'High-performance NVIDIA processor' if there are two active graphics systems running on the PC.

4. AMD graphics cards

4.1: Right-click empty space on the Desktop. 

4.2: From the menu select AMD Catalyst Control Center or AMD Radeon Settings - depending on what's available.

4.3: Follow the instructions on the following AMD web page in order to set Lumion.exe to 'High Performance', so that the fast AMD graphics card is used:

• External Link: Configuring Laptop Switchable Graphics on a Windows® Based System

4.4: Start Lumion.

5. Verify that Lumion is using the fast NVIDIA or AMD graphics card

After making the change to the dedicated NVIDIA/AMD graphics card, Lumion may sometimes still display the Intel HD graphics chip on the Benchmark results screen. You can safely ignore this.

5.1: However, once you have run the Benchmark test again, the score should now be significantly higher which will indicate that the correct graphics card is used.