DaVinci Resolve render caches block local SSD space with bloated ghost files

You hit the export shortcut, lean back into your desk chair, and watch the blue timeline playhead crawl toward the finish line. Then the playback engine stutters, the timeline counter freezes at frame 1,420, and a sharp system alert chimes through your studio monitors. You open your file manager, and there it is: a solid crimson drive bar glaring back at you, showing literally zero available gigabytes on a high-speed internal drive that held half a terabyte just two weeks ago.

Your desktop trash can sits empty. You have already archived the camera raw files from last month’s client shoot onto an external hard disk, and you even right-clicked and deleted the finished project timeline directly from the project manager screen. Yet your fast NVMe solid-state drive remains utterly choked, gasping for breath under the weight of hundreds of invisible gigabytes that do not show up in your standard document folders.

This silent storage theft happens across editing suites every single day. The natural assumption is that closing or deleting a video project cleans up after itself. In the architecture of post-production software, however, the workspace and the scratchpad live on two completely separate planes of reality. Your database thinks the project is long gone, but your physical hardware is still babysitting every single frame you ever previewed.

The Phantom Architecture: Why Trashing Projects Leaves Ghost Files

To understand where your missing gigabytes went, think of high-end video editing software like an industrial commercial kitchen. When you slice ingredients at your cutting board, you do not throw each vegetable scrap into the main garbage dumpster out back after every single cut. You brush them into an under-counter compost chute so your hands keep moving fast. DaVinci Resolve operates the same way with its background render pipeline.

Whenever you add a noise reduction node, drop a complex title graphic onto the timeline, or smooth out a shaky handheld shot, the software generates a temporary, fully uncompressed video file behind the scenes. This allows smooth 60-frames-per-second playback without pegging your graphics card to its absolute thermal limit. These temporary files are called render caches, and they do not live inside your project database.

Instead, they get dumped into a deeply nested scratch directory named CacheClip. The critical catch is simple: when you delete a project from your software dashboard, the application simply removes the index card pointing to the recipe. It does not touch the massive pile of pre-cooked preview clips sitting inside that hidden folder on your hard drive.

Marcus Vance, a 36-year-old independent commercial colorist working in Austin, spent weeks chasing what he assumed was a failing 2TB internal SSD. After delivering four corporate video campaigns and archiving the source footage, his drive was pinned at 98 percent capacity. When he finally audited the hidden file structure, a single forgotten CacheClip directory contained over 850GB of orphaned 12-bit uncompressed preview renders from timelines that had been deleted from his project manager three months earlier.

Dissecting the Cache Layers: Smart Caches Versus Fusion Scratch

Not all cache files behave the same way, and understanding how your system generates them keeps your storage drives from choking during critical deadlines.

The Timeline Render Cache (ProRes and DNxHR Bloat)

By default, high-end editing software writes background preview renders using high-bitrate mezzanine codecs like Apple ProRes 422 HQ or Avid DNxHR HQX. A mere ten-minute 4K timeline can silently generate over eighty gigabytes of previews in less than an hour of normal color grading. If you leave the render cache toggle set to ‘Smart’, every single micro-adjustment to a color wheel or exposure slider creates a brand-new cache file on disk without automatically purging the old iteration.

The Fusion Node Cache Trap

Motion graphics and visual effects nodes inside the Fusion workspace consume scratch space at an even more aggressive rate. Complex particle systems, paint cleanups, and green screen keys cache raw floating-point frame sequences directly into subfolders inside the cache directory. If you routinely build visual effects without manually clearing node caches, a three-second graphic can quietly claim twenty gigabytes of disk space.

The Reclaim Protocol: Safely Purging the CacheClip Folder

You can reclaim this phantom space in minutes without risking project corruption or losing raw camera media. Follow this practical, mindful routine to restore your drive headroom.

First, purge your cache from inside the software interface before resorting to manual file deletion:

• Open your current active project and navigate to the top system menu under Playback.
• Hover over Delete Render Cache and select All to wipe existing preview renders for the open timeline.
• To clear unused proxy assets, select Delete Render Cache > Unused, which safely cleans up abandoned color-grade versions while retaining your active preview.

If you have already deleted older projects and cannot open them to clear their caches through the interface, you must navigate directly to the physical storage directory:

• Open software preferences using the hotkey combo Ctrl + Comma (Windows) or Cmd + Comma (Mac).
• Navigate to System > Media Storage and identify your primary scratch location.
• Open your operating system file browser, navigate to that exact drive path, locate the CacheClip folder, and check its folder size.
• Delete the sub-folders corresponding to old project UUID strings, or empty the entire folder if no active timelines currently require pre-rendered playback.

The Bigger Picture: Clean Drives Build Clean Timelines

A cluttered scratch disk does more than steal storage headroom; it introduces micro-stutters to playback, increases project launch times, and triggers unprovoked export crashes right when client deadlines loom largest. Treating your scratch storage like a professional prep table—clearing away the trimmings the moment the dish is plated—restores both computational speed and mental clarity. When your drives breathe easily, your creative focus stays exactly where it belongs: on the craft of the cut.

Video software never forgets a single frame you previewed until you deliberately tell the file system to let it go.

Frequently Asked Questions

Will deleting the CacheClip folder delete my original video files?
No. The CacheClip directory only contains temporary preview renders created by the software. Your original camera footage, audio tracks, and project files remain untouched in their original storage folders.

Why doesn’t DaVinci Resolve clear the cache automatically when I close the program?
Render caches are designed to persist across editing sessions so you don’t have to wait for heavy effects and color grades to re-render every time you open a project.

Can I safely delete the entire CacheClip folder while the software is running?
It is best practice to close the editing software completely before manually deleting the CacheClip folder in your operating system’s file browser to prevent file-locking errors.

What is the best cache format for balancing quality and drive space?
For most color grading and editing workflows, ProRes 422 LT (on Mac) or DNxHR SQ (on Windows) provides completely fluid real-time playback at a fraction of the file size generated by uncompressed or HQ codecs.

How do I stop my main C: drive from filling up with cache files?
Go to Preferences > System > Media Storage, add a secondary internal or fast external drive to the top of the list, and make sure your project settings point to that drive for all cache and gallery paths.