This will enable a new tab called Internal tab in the options. Click Options and while holding Ctrl + Shift, click Preferences.Thus, remaining cores are not being utilized by Vegas Pro to process videos quickly which will enable the preview video to get smooth.
The problem may be arising because Vegas Pro is consuming only one core of the processor.
Change the value of Dynamic RAM Preview max (MB) to 0 (zero). Drag the video file on the video track. 
Click Start, search Vegas Pro and run it. Solution 2: Changing Dynamic RAM Preview Valueĭue to some arbitrary reason, the RAM Preview configuration might not suit your project media which could be causing this error. If it does not, proceed with the other solutions. Note: Normally it is set as Preview (Auto). Click Preview/Best/Good > Preview > Quarter. Import some video file by clicking File > Import > Media. Therefore, it is always ideal to select a preview setting that will not burden up your PC and is suitable enough for you to perform editing. Sometimes, a set preview setting can be too much for your computer to process in time. Furthermore, a hard disk drive with a low transfer rate (on which Vegas Pro is installed) can also cause this problem. 
RAM and Hard Drive: We all are familiar with these Random Acess Memory or RAM is required by a computer to run different processes and Hard drive is required by a computer to store data. Most people suffering from this problem have low-quality Graphics Processing Unit or GPU which do not have the graphical processing power to support Vegas Processing. GPU Bandwidth: As previously explained, people keep upgrading their camera tech while ignoring their computer specifications. This means that Vegas Pro has to do a lot of work to decode the video as it is playing back in real-time. Video Codec: AVCHD H.264 video codec is used by the vast majority which specializes in saving video files after highly compressing them. Thus, the same CPU now needs to work six times more when editing with Vegas, which causes the lag. 
Standard Definition video is up to six times smaller in file size compared to Full 1080p HD video.
Poor CPU Power: This problem genuinely started when people started to upgrade their Standard Definition Cameras to AVCHD Video Cameras but were still running their computers on Duo Core Central Processing Unit or CPU.
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