Performance Optimisation

Smooth playback is the difference between editing and waiting. Lightworks gives you several levers - proxies, playback quality, GPU precision, and housekeeping habits - to keep a heavy project responsive on the hardware you have.

The big lever: proxies

Proxies are lightweight copies of your media that play easily where camera originals struggle. Generate them for demanding formats and let Lightworks use them automatically during editing; exports always use the originals. This is the single most effective performance improvement for high-resolution or camera-raw material (see Proxies and performance media).

Playback media quality

The Playback Media Quality setting on the video page of the project settings controls which media Lightworks plays - originals or proxies - so you can trade fidelity for responsiveness while cutting and switch back for finishing.

GPU precision

GPU Precision (output page of the project settings) selects 8-bit or 16-bit processing. 8-bit is faster and fine for editing; 16-bit is for grading and final rendering. If effects-heavy playback is sluggish, check you're not paying for 16-bit while you cut.

Camera raw decode settings

R3D and BRAW clips have configurable decode settings - lowering decode quality during the edit makes raw material far more responsive, and you can restore full quality for finishing (see Media formats and technical settings).

Let background tasks finish

Imports, transcodes, proxy generation, and exports run as background tasks. They're designed to let you keep working, but they do consume disk and CPU - if the system feels sluggish, check the Tasks page and let heavy jobs complete (see Batch export and background tasks).

Hardware and housekeeping

• Storage speed matters most. Editing several video streams demands sustained disk throughput - fast local SSDs beat network shares and USB drives for active projects.
• Keep the media drive from filling up. Very full drives slow down, and imports, proxies, and renders all need headroom.
• GPU drivers - keep them current; the display pipeline and many effects run on the GPU.
• Close other heavyweight applications while editing - browsers and background sync tools compete for the same memory and disk.

A quick triage when playback stutters

1. Is the material heavy (4K+, camera raw, H.265)? Make proxies.
2. Are effects the load (playback fine until the graded section)? Check GPU precision and consider deferring heavy effects until picture lock.
3. Is the whole system slow? Check background tasks and disk space.
4. Is only one clip bad? Check its format - a lone VFR or odd-codec clip can be converted on import (see Importing media).

Tip: Sequences play more smoothly on a second pass once material is cached - a first-play stutter that vanishes on replay is normal, not a fault.