RECOMMENDED: Click here to fix Windows errors and optimize system performance.

Why is my preview window so slow when I try to edit my project? Before you answer this question, you should know that some degree of slowdown or frame loss is normal with all video editing programs.

When a video is played in the preview window, it is not played back as a video on a computer or TV. In fact, it is decompressed in real time, and every second your processor and graphics card perform millions of calculations.

The more the video is compressed, the harder it is to decompress it in real time. Because of this, GoPro videos can be very slow because they are super compressed. On the other hand, you can play very large uncompressed AVI videos that play very smoothly in the preview window.

When you play a video in the Preview window, there are often several video tracks playing simultaneously, and some of these tracks also have video effects applied to them. That’s a lot of different information to evaluate at 25 or even 60 frames per second! There is a very simple way to understand all this. How long does it normally take a computer to make a 5 minute video? Let’s say it takes 10 or 15 minutes.

Why Sony Vegas Preview is late on Windows

This problem turned into a huge epidemic when people started switching from standard definition cameras to AVCHD camcorders, but still used their old computer with a dual core processor. Full 1080p HD video is up to six times larger than the standard definition video used on DVDs.

This means that your CPU (the CPU is the brain of your computer) has to work six times harder to play a video while editing in Vegas. On an old computer, 1080p HD video freezes the whole computer.

The other major problem with HD camcorders is the video codec they use to store the video. The vast majority of cameras use the AVCHD H.264 video codec, which has a high compression rate. This means that Vegas still has a lot of work to do to decode the video in real time during playback, which certainly contributes to the lag problem.

If you convert AVCHD video to an uncompressed .avi codec before importing it into Vegas, you’ll see a significant improvement in playback quality, but this method takes up a lot of disk space. Uncompressed video is MASSIVE – AVCHD video files can range in size from a few hundred megabytes to several gigabytes – it’s a situation you can’t win.

The most important thing you can do to improve Vegas playback is to make sure your computer has at least a modern 4-core processor with a decent GHz speed. If you’re using an older computer, it’s time to buy a new one if you really want to edit HD video.

All the other components of your computer also have a significant impact on the quality of video playback in Sony Vegas. You should also think about a decent GPU (graphics processor), fast and clean hard drives, and enough RAM (memory). Sony Vegas and other video editing software are increasingly leveraging the power of your GPU to speed up rendering and improve preview windows.

Fix the Sony Vegas preview delay on Windows

April 2021 Update:

We now recommend that you use this tool to fix the error. The tool also repairs common computer errors, protects against file loss, malware and hardware failures, and optimizes your PC for optimal performance. With this software, you can quickly fix your PC’s problems and prevent others from getting them too:

  • Step 1: Download the PC repair and optimization utility (Windows 10, 8, 7, XP, Vista – Microsoft Gold Certified).
  • Step Two: Click on the Start scan button to detect problems in the Windows registry that may be causing PC problems.
  • Step Three: Click the Fix All button to fix all issues.

Change dynamic RAM sample value

For some reason the RAM preview setting does not match the media in your project, causing this error. Follow these steps to solve the problem:

  1. Click Start, find Vegas Pro, and start it.
  2. Import the video file by clicking File -> Import -> Multimedia. Select the video file you want to edit.
  3. Drag the video file onto the video track.
  4. Tap Settings -> Preferences.
  5. Click on the Video tab.
  6. Change the Dynamic RAM Preview max (MB) value to 0 (zero). Normally set at 200.
  7. Click Apply and OK.
  8. Watch the video. This may solve your problem.

Enable multithreaded rendering

The problem may be that Vegas Pro only uses one CPU core. As a result, the remaining cores in Vegas Pro are not used for fast video processing to ensure smooth video playback. Proceed as follows:

  1. Click Start, find Vegas Pro, and start it.
  2. Import the video file by clicking File -> Import -> Multimedia. Select the video file you want to edit.
  3. Drag the video file onto the video track.
  4. Press the Settings button and while holding down the Ctrl and Shift keys, press the Settings button. This activates a new tab called Internal in the Preferences.
  5. Choose the tab Internal.
  6. In the Show presets only line, enter Include several.
  7. Enter a value of True. Click on Apply -> OK.
  8. Watch the video. This may solve your problem.

Changing the example setting

Sometimes a fixed preview can overload your computer if you need to change it in time. Therefore, a preview configuration that doesn’t tax your PC and is sufficient for editing is always ideal. Here’s how:

  1. Click Start, find Vegas Pro, and start it.
  2. Import the video file by clicking File -> Import -> Multimedia.
  3. Select the video file you want to edit.
  4. Drag the video file onto the video track.
  5. Click on Preview/Control -> Preview -> Environment. This parameter is normally set to Example (Auto). Watch the video.

Reinstalling Sony Vegas

If none of the above solutions have worked, any of them could be causing a problem. So, to reinstall Vegas Pro perfectly, follow these steps.

  1. Click Start, search for and launch Control Panel.
  2. In the Programs pane, click Uninstall a program.
  3. Search for Vegas in the search bar. Double-click it and delete it.
  4. Reinstall Vegas Pro as you installed it the first time.
  5. Launch Vegas Pro and play any video from your project in Vegas. This should solve your problem for good.

RECOMMENDED: Click here to diagnose Windows errors and optimize system performance.

frequently asked questions

frequently asked questions

How do I get Vegas Preview to join the class?

Why is my preview in Sony Vegas delayed?

The vast majority of cameras use the AVCHD H. 264 video codec, which has a high compression rate. This means that Vegas has to do a lot more work to decode the video as it plays back in real time, which certainly contributes to latency issues.

How can I make Vegas Pro faster?

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