I have 4GB ram 2GB graphics card but my laptop preview is lagging

[Hudson555x]

Depending upon the video you are editing, you may be lucky to have Shotcut work at all.
You’re at the very bottom of the specifications for Shotcut to work.
Shotcut - Frequently Asked Questions

How to Reduce Memory Usage

Here are ways to reduce the memory usage in general: Save and restart Shotcut Close other browser tabs. Close other applications. Reboot (does all of the above). Here are ways to reduce the memory usage of your project: Reduce the resolution of the Video Mode. Reduce the number of tracks. The number of tracks will increase the amount of caching to prevent files from being closed and reopened repeatedly from one frame to the next. Here are some ways to reduce the memory usage while editing: …