Many Windows users are reporting that VLC Media Player suddenly takes several seconds, sometimes up to 30 seconds, to open a video or audio file. The delay has nothing to do with the file you are playing. It happens even with small MP3s and shows up right after VLC’s splash screen loads. Below are three fixes, starting with the quickest one.
Fix 1: Reset VLC’s Plugin Cache to Speed Up Startup
VLC stores a plugin cache file called plugins.dat that lets it start up quickly. When this file gets quarantined or corrupted, VLC has to rebuild its plugin list from scratch every time it launches, which causes the long delay.
To fix this, search for VLC in the Windows Start menu and open VLC media player – reset preferences and cache files. Run this shortcut and let it finish. This rebuilds plugins.dat and restores normal startup speed, usually back to under a second.
If that shortcut is missing, you can trigger the same rebuild manually. Open Command Prompt, navigate to VLC’s install folder with cd "C:\Program Files\VideoLAN\VLC", then run:
vlc.exe --reset-plugins-cacheRelaunch VLC afterward. If it opens in under a second, the cache rebuild worked and you can stop here.
Fix 2: Reinstall VLC to Fix the Slow Startup
If resetting the cache does not help, a clean reinstall forces VLC to generate a fresh plugin cache from scratch.
- Uninstall VLC from Settings > Apps > Installed apps.
- Download the latest installer from videolan.org.
- Install it and launch VLC once to rebuild the cache.
This works well if the earlier cache file was already deep in quarantine and the reset shortcut could not touch it. Launch VLC and time the startup. If it now opens quickly, the reinstall fixed it and Fix 3 is optional.
Fix 3: Exclude VLC from Microsoft Defender Scans
The root cause of this issue is Microsoft Defender quarantining VLC’s plugin cache after a flawed signature update. Adding a Defender exclusion for VLC’s install folder stops this from happening again.
On both Windows 10 and Windows 11:
- Open Windows Security from the Start menu.
- Go to Virus & threat protection > Virus & threat protection settings > Manage settings.
- Scroll to Exclusions and select Add or remove exclusions.
- Choose Add an exclusion > Folder, then select
C:\Program Files\VideoLAN\VLC\plugins.
If you installed VLC through a portable version or a custom install location, the plugins folder sits inside wherever you placed the VLC folder instead of Program Files. Right-click the VLC shortcut, choose Open file location, and look for a plugins folder in that same directory.
Only do this if you installed VLC from the official VideoLAN website. Excluding a folder tells Defender to stop scanning it, so it should not be used with files from an untrusted source.
What Causes VLC to Take So Long to Start
- A faulty Microsoft Defender signature update (version 1.455.50.0) started flagging VLC’s plugin cache as suspicious.
- Windows Update KB5121003, released on August 11, introduced changes that made Defender quarantine the cache file on affected machines.
- The issue appears mainly on Windows 10 systems, though some Windows 11 machines with the same Defender signature are also affected.
- VLC itself has no code changes tied to this slowdown; the delay comes entirely from Defender interfering with the cache file.
Frequently Asked Questions
Will Microsoft fix this automatically?
Microsoft has not released an official patch for this specific Defender behavior yet. Regenerating the cache or adding a Defender exclusion currently gives the most reliable fix.
Does reinstalling VLC delete my playback settings?
Yes, a full uninstall and reinstall resets VLC’s preferences along with the plugin cache. If you want to keep your settings, try Fix 1 first since it only touches the cache file.
Is it safe to exclude VLC’s plugin folder from Defender?
It is safe as long as you installed VLC from the official videolan.org site. Only exclude the exact plugins folder path, not your entire drive, and avoid this step if you downloaded VLC from a third-party site or torrent.
Why does this issue affect Windows 10 more than Windows 11?
Reports point to the Defender signature update rolling out unevenly, so Windows 10 machines with signature version 1.455.50.0 hit the bug more often. Some Windows 11 systems on the same signature version show the same slowdown, so the version matters more than the OS itself.
How do I check which Defender signature version I have?
Open Windows Security > Virus & threat protection, then scroll to Virus & threat protection updates and select Protection updates. Your current signature version is listed there, so you can confirm whether you are on the affected build before troubleshooting further.
