Assuming you’re editing just HD footage and not 4K footage then your system is actually right at the minimum. If it’s 4K footage you are editing then you are below the minimum requirements.
Here is a link to the minimum system requirements:
However, there is already solutions to this. Use both Preview Scaling along with proxies.
Here is the documentation on the Preview Scaling feature:
The Preview Scaling setting may be used to reduce the resolution of video processing when you are using a fair amount of filters, transitions, and track blending. This may help with the performance during the editing process.
However, keep in mind that the source video or images must typically be scaled down to the designed preview scale, and that will have a processing cost.
The submenu lists only the vertical resolution. The horizontal resolution depends on the aspect ratio of your …
Here is the documentation on Shotcut’s proxy feature:
Proxy editing is the process of creating and using low resolution videos and images in places of the original or optimized (Convert to Edit-friendly) files. This provides the advantage that your computer has less work to do in realtime while editing: decoding, scaling, and effects. This is, quite simply, because there are less pixels to compute. Then, when you are ready to export, it will use the original (or optimized) files for full quality.
Performance is optimal when the prev…
Also, forum member
@bentacular made a video showing the Shotcut’s proxy feature: