---
title: "Why Final Cut Pro is Running Slow"
author: "Alex Johnson"
category: Troubleshooting
excerpt: "Direct solutions for fixing slow performance, lagging playback, and high CPU usage in Final Cut Pro."
image: "/cutsio-thumbnail.svg"
tags: "Final Cut Pro, Performance, Lag, Troubleshooting"
---

Final Cut Pro is running slow typically due to massive background rendering processes, high-resolution media playing from slow storage, or bloated cache files.

Here are the direct methods to speed up Final Cut Pro.

## How do you fix slow performance by disabling background render?
If Final Cut Pro grinds to a halt while you are editing, the software is likely constantly rendering the timeline in the background.

To fix slow performance by disabling background render:
1. Open Final Cut Pro.
2. Go to **Final Cut Pro > Settings > Playback**.
3. Uncheck the box for **Background render**. This stops the software from secretly processing complex clips and saves CPU power.
4. From now on, manually render heavy clips by selecting them and pressing `Ctrl+R`.

## How do you fix lagging playback with proxy media?
If you are editing 4K, 6K, or 8K video, your Mac may struggle to decode the large files in real-time, causing lag.

To fix lagging playback using proxy media:
1. Select all heavy clips in the Browser.
2. Right-click and choose **Transcode Media**.
3. Check **Create proxy media** and select a lower resolution (e.g., 50% or 25%).
4. Click **OK** and wait for the transcode.
5. In the top right corner of the Viewer, click the **View** drop-down menu and select **Proxy Preferred**. The timeline will now play the fast, lightweight versions.

## How do you fix slow performance by clearing cache files?
If your Mac is out of hard drive space, Final Cut Pro will crawl because it has no room for temporary memory swapping.

To fix slow performance by clearing cache files:
1. Select the slow Library in the Browser.
2. Go to **File > Delete Generated Library Files**.
3. Check the box for **Delete Render Files**. Select **All** or **Unused Only**.
4. Check **Delete Proxy Media** and **Delete Optimized Media** if you do not need them anymore.
5. Click **OK**. This instantly deletes bloated cache files, freeing up massive amounts of storage space and improving speed.