---
title: [SR] Lumion is taking a long time to launch.
description: Lumion takes a long time to open or launch.
---
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March 23, 2026
# \[SR\] Lumion is taking a long time to launch.
\[SR\] Lumion is taking a long time to launch.
**1. Question:
1.1:** Why is Lumion taking so long to open?
**2. Standard Reply:
2.1: Answer:**
Hi,
Thanks for reaching out.
It may be that something is blocking Lumion from starting normally. Let's check the following:
1\. Confirm that you have the latest Windows Updates available.
2\. Let's check if you have the right exclusions in your Antivirus and Firewall software:
Follow this article:
- **Knowledge Base:** [How do you resolve antivirus and firewall problems?](https://support.lumion.com/hc/en-us/articles/360008351733?hsLang=en-us)
to the Microsoft site:
- **External Link:** [Add an exclusion to Windows Defender Antivirus](https://support.microsoft.com/en-us/help/4028485/windows-10-add-an-exclusion-to-windows-defender-antivirus)
Add exclusions for
1. The *Lumion.exe* in the Installation folder.
2. The *Installation* folder: usually C:\\Program Files\\Lumion.
3. The *Lumion-Documents* folder wherever that is: default Documents\\Lumion 2026.
- **Knowledge Base:** [How do you change the location of the Lumion-documents folder?](https://support.lumion.com/hc/en-us/articles/9666947277980?hsLang=en-us)
Let us know how it goes.
**3. Cause/Background information:**
**3.1:** Reference:
- https://community.lumion.com/index.php?threads/lumion-not-starting-up-or-taking-a-few-minutes.5758/
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