Hi,

As an experienced video editor who has spent years troubleshooting hardware bottlenecks, I completely get the frustration. There is nothing worse than having a project right at the finish line only for your computer to grind to a halt.

While a 3-minute video made of game screenshots and photos seems like it should be lightweight, video editors like CapCut treat high-resolution images very differently than standard video files.

When you drop high-res photos into a timeline, the software has to decode those massive files, keep them completely uncompressed in your RAM, and apply any transitions, motion effects (like Ken Burns zooms), or filters in real-time. If you have dozens of photos stacked up, it will easily chew through 16 GB of RAM.

Based on my experience optimizing editing workflows, here is a step-by-step checklist to clear the bloat, optimize your project, and force CapCut to release your RAM so you can finish those last few edits.

1. Wipe the CapCut Cache

In my testing, CapCut’s background cache is usually the biggest culprit for sudden memory leaks. It generates massive amounts of temporary files and preview data that stay locked in your system's memory.

• From the main CapCut dashboard (before opening your project), click the Gear Icon (Settings) in the top right corner.

• Select Settings and go to the Project (or Draft) tab.

• Look for the Cache Size section and click the Trash Can / Delete icon. (Don't worry, this won't delete your photos or timeline edits; it just dumps the background junk).

2. Force turn on Proxies & Hardware Acceleration

Since you’ve already lowered your preview settings, we need to make sure CapCut's proxy system is actually engaged. Proxies create tiny, low-resolution "stand-in" versions of your photos to use while editing, lowering RAM usage dramatically.

• Go back to CapCut Settings (the Gear icon) and click the Performance tab.

• Check the box next to Proxy and set it to Performance or 720p.

• While you are there, ensure Hardware Encoding and Hardware Decoding are both checked. This forces CapCut to share the load with your graphics card instead of leaning entirely on your CPU and RAM.

3. Clear the Timeline Render Cache

If you've been previewing the timeline over and over, CapCut stores temporary preview files directly inside that specific project file, which eats up memory.

• Open your music video project.

• Right-click an empty space on your timeline or right-click your clips.

• Look for the Render menu option and click Delete Rendering Cache.

4. Optimize Your System Resources

If CapCut is still hovering at 90%, your web browser or background apps are likely fighting it for the remaining 10% of your 16 GB RAM. I always recommend two quick habits when editing on a mid-range system:

• Close Your Web Browsers: Chrome and Edge are notorious RAM hogs. Closing them can instantly give CapCut 2 to 4 GB of breathing room.

• Restart Your PC: Before you jump back in to finish those final edits, do a quick system reboot. This completely flushes your RAM of any lingering tasks or memory leaks from other programs.

The "Nuclear Option" (If it still lags)

If your timeline is clogged with tons of tiny cuts, heavy transitions, and text layers, the project engine itself might just be maxing out.

If it remains completely unusable after trying the steps above, my ultimate workaround is to export the first 2 minutes of the video as a high-quality MP4.

Then, start a brand-new project, drop that pre-rendered 2-minute video file back in, and finish editing the final 1 minute.

This flushes out all the individual, resource-heavy layers and lets you finish your project without crashing your system.

Give the cache wipe and proxy settings a shot first—in most cases, that solves the issue immediately!