Mac Slow When Editing Video? 8 Ways to Get Back Up to Speed

Video editing exposes a Mac like nothing else. The same machine that handles email, Slack, and 30 Chrome tabs without complaint becomes wheezy and stuttery the moment you drop a 4K H.265 clip onto a timeline. The tools — Final Cut Pro, Premiere Pro, DaVinci Resolve — are designed to be demanding because the work itself is.

Some performance issues with video editing on Mac are unavoidable hardware limits. Most are not. Here are the eight fixes that resolve the majority of “my Mac is slow when I edit” complaints, in roughly the order I’d try them.

1. Use proxies. Always.

This is the biggest one. If you’re editing 4K H.265 footage from a Sony FX3, GoPro, iPhone, or similar — or any high-bitrate codec — and not using proxies, you’re asking your Mac to decode huge amounts of data per frame in real time. Even an M3 Max struggles.

Proxies are low-resolution, easy-to-decode versions of your footage that the editor uses for playback. You see proxies; the final render uses originals. The performance difference is dramatic.

• Final Cut Pro: Select clips → File → Transcode Media → Create Proxy Media. Use proxies in the View menu.
• Premiere Pro: Right-click clips → Proxy → Create Proxies. Toggle Proxy mode in the Program panel.
• DaVinci Resolve: Generate proxies via Media Pool right-click. Toggle in Playback menu.

The proxy generation takes time upfront. Editing afterwards is night-and-day faster. On a base M2 MacBook Air, proxies are the difference between “unusable” and “comfortable” for 4K work.

2. Free up significant scratch disk space

Video editors hammer the disk for caching, render files, and scratch data. They need real space to work — not “5GB free” space.

Aim for 20%+ free on whatever drive holds your projects. Better still, use a dedicated external SSD over Thunderbolt for project files and let the internal drive handle the OS and apps.

Apple menu → System Settings → General → Storage — get a sense of where you stand.

Common video-specific space hogs:

• Cache and render files — can be 50-200GB per project
• Old project versions — auto-saves accumulate
• Imported media you’ve forgotten — often duplicated across projects
• Final Cut Pro libraries — include both media and renders by default

Skip the manual huntSweep finds every cache, log, and forgotten file in seconds — and only removes what you OK. Download Sweep free →

3. Set scratch disks to a fast external

Internal SSDs on Apple Silicon Macs are fast — often 5-7 GB/s read/write. But they’re also small and fill up fast. Once filled, they slow down dramatically.

Configure your editor to use an external SSD for cache and renders:

• Premiere Pro: Edit → Preferences → Media Cache. Set Media Cache Files and Media Cache Database to the external.
• Final Cut: File → Library Properties → Modify Settings → Storage Locations. Move “Media”, “Cache”, “Backups” to external.
• DaVinci Resolve: Preferences → Media Storage. Set the order of disks; put external first.

A good Thunderbolt 4 NVMe enclosure with a fast NVMe SSD can hit 2-3 GB/s — plenty for editing, and it doesn’t fill your internal drive.

4. Quit everything that isn’t editing

Video editors want as much RAM and GPU as they can get. Browsers, Slack, Discord, mail clients, music apps — all eat into what’s available.

Before a serious editing session:

1. Quit all browsers
2. Quit Slack, Discord, Teams, Zoom (unless on a call)
3. Quit Spotify or pause music
4. Quit any background sync apps temporarily (Dropbox, OneDrive, Google Drive)
5. Quit cloud Photos / iCloud Drive activity if possible

Activity Monitor → Memory tab → see what’s using significant memory. Quit those things and watch how much your editor’s available memory grows.

5. Disable visual effects in macOS

This matters less than it used to but still helps a bit, especially when scrubbing timelines and using complex effects panels.

System Settings → Accessibility → Display:

• Reduce Motion — ON
• Reduce Transparency — ON

These reduce the GPU work macOS itself is doing, freeing more for your editor. The difference is small but real, especially on lower-end chips.

6. Match project settings to your timeline

Video editors render proxies based on timeline settings. If your timeline is 4K but your output is 1080p, you’re wasting performance. If your timeline is set to a different framerate than your footage, the editor is constantly conforming.

Set timeline:

• Resolution — match your final output resolution, not your highest-resolution clip
• Framerate — match your primary footage; 24, 25, 30, or 60 depending on project
• Codec — choose appropriately for your render workflow

For most YouTube content, a 1080p timeline at 30fps is the right baseline even if some footage is 4K. Render at 1080p, deliver at 1080p.

7. Update everything (or don’t)

Video software has a complicated relationship with macOS updates. Sometimes updates help significantly (FCP got faster on M3 with Sonoma 14.4). Sometimes updates break critical plugins (Premiere has had this happen multiple times).

The safest approach:

• Stay one minor version behind the latest macOS for production work
• Update editor versions individually after checking compatibility forums
• Never update during an active project unless you have a backup workflow

Adobe, Apple, and Blackmagic all publish compatibility notes for their video tools. Check before you update either side of the stack.

8. Manage your render and cache files

Editors generate a lot of cache. Premiere’s Media Cache, Final Cut’s Render Files, Resolve’s Optimized Media — all eat space and benefit from periodic cleanup.

For Premiere: Edit → Preferences → Media Cache → Delete unused media cache files (or “Delete” all if you’ve finished a project).

For Final Cut: File → Library Properties → “Delete Generated Library Files” (you can choose to keep proxies and just delete renders).

For Resolve: it manages cache internally; check Project Settings → Master Settings → Working Folders.

After finishing a project, archiving it to external storage and deleting the editor’s cache for it can free hundreds of GB.

Make this a one-click jobSweep does the same hunt in seconds. Always shows you what’s about to go. Free for macOS →

Beyond the eight: when to consider hardware

Some video editing slowness genuinely is hardware-bound:

• Heavy color grading with multiple nodes — needs more GPU than base chips have
• Multi-cam 4K editing — needs significant memory bandwidth
• 8K editing — base chips just can’t do this comfortably
• Complex VFX with multiple layers — can saturate even high-end chips

If you’re a professional editor doing demanding work, the difference between a base M3 and an M3 Max is real and worth paying for. The chip RAM bandwidth alone is 6x — that translates directly to playback performance.

For someone editing weekly YouTube videos at 1080p or basic 4K, even a base M2 MacBook Air handles it fine with proxies. Don’t over-buy.

App-specific quirks

Final Cut Pro

The most Apple-Silicon-optimized editor. Generally fastest on Apple Silicon. If you’re choosing an editor and on Apple hardware, FCP is usually the performance winner.

Premiere Pro

Improved a lot on Apple Silicon but historically slower than FCP. Heavy reliance on third-party plugins makes it more vulnerable to compatibility issues across macOS updates.

DaVinci Resolve

Excellent color and audio tools; performance varies. Free version is fully featured for most users. Studio version unlocks GPU acceleration for some effects.

The real performance unlock

Honestly, 80% of video editing slowness comes down to: not using proxies, full disk, too many other apps running. Fix those three things and most editors feel fast on most modern Macs.

The remaining 20% is hardware-bound work that needs a beefier chip or more RAM. That’s a separate conversation, and an honest one — you can tell when you’ve hit a hardware ceiling because no software optimization helps anymore. Until then, the eight fixes above cover most cases.

Try proxies first. The single biggest unlock for editing performance on a Mac is almost always proxies.