---
title: "How to Fix Slow Rendering in DaVinci Resolve"
author: "Alex Johnson"
category: Tips
excerpt: "Direct methods for optimizing render cache, proxy media, and GPU acceleration."
image: "/cutsio-thumbnail.svg"
tags: "DaVinci Resolve, Slow Rendering, Performance, GPU, Best Practices"
---

The best way to fix slow rendering in DaVinci Resolve is to enable GPU acceleration, generate optimized media, and activate the smart render cache.

Here are the direct methods to fix slow rendering in DaVinci Resolve.

## What is the fastest way to enable GPU acceleration?
If your DaVinci Resolve export is taking 10 hours for a 5-minute video, your computer is relying entirely on the CPU (Central Processing Unit) to calculate complex effects and color grades, bottlenecking the entire render pipeline.

To quickly enable GPU acceleration:
1. Open DaVinci Resolve and go to the top menu bar.
2. Click **DaVinci Resolve > Preferences**.
3. Select the **System** tab, then click **Memory and GPU** on the left.
4. In the **GPU Configuration** section, uncheck the box for **Auto**.
5. Select the **GPU Processing Mode** (CUDA for Nvidia, OpenCL/Metal for AMD/Mac).
6. Check the box next to your dedicated graphics card (e.g., RTX 4090, Radeon RX 7900).
7. Click **Save** and restart DaVinci Resolve. The software will instantly shift the entire rendering workload to your graphics card, cutting export times by up to 90%.

## How do you generate optimized media?
If your timeline is filled with massive 4K or 8K H.265 footage from a drone or a mirrorless camera, DaVinci Resolve struggles to decode the highly compressed files in real-time, causing massive stuttering and extremely slow exports.

To generate optimized media:
1. Open the **Edit** page (Shift+4).
2. Go to the top menu bar and click **Playback > Optimized Media Resolution**. Select **Half** or **Quarter**.
3. Click **Playback > Optimized Media Format**. Select **ProRes 422 Proxy** (Mac) or **DNxHR SQ** (Windows).
4. Select all the laggy clips in your **Media Pool** or on the timeline.
5. Right-click the clips and choose **Generate Optimized Media**. DaVinci Resolve will transcode the heavy H.265 files into buttery-smooth editing formats, instantly fixing playback and rendering bottlenecks.

## How do you activate the smart render cache?
If your timeline is filled with heavy Fusion titles, noise reduction, or complex color grading nodes, DaVinci Resolve cannot process those effects in real-time and will completely freeze during playback or export.

To activate the smart render cache:
1. Open the **Edit** page (Shift+4).
2. Go to the top menu bar and click **Playback > Render Cache**.
3. Select **Smart** (instead of None).
4. Wait a few seconds. A red bar will appear above the heavy clips on your timeline and slowly turn blue as DaVinci Resolve processes them in the background.
5. Once the bar is blue, the clips will play back perfectly smoothly and export instantly because they are already pre-rendered.