Reducing High CPU Usage During Capture
Optimize CPU usage when streaming or recording. Hardware encoding, resolution scaling, and performance tuning.
The Problem
CPU usage hits 90-100% during streaming or recording, causing lag, dropped frames, and system slowdowns.
The Solution
Switch to hardware encoding (GPU), reduce output resolution, lower encoding quality preset, and close background applications.
Step-by-Step Instructions
Enable Hardware Encoding (CRITICAL for low CPU usage):
OBS: Settings > Output > Encoder
- NVIDIA GPU: Select 'NVENC H.264 (new)' - reduces CPU from 30% to 5%
- AMD GPU: Select 'AMD HW H.264'
- Intel CPU with iGPU: Select 'QuickSync H.264'
Reduce Output Resolution: 1080p to 720p saves 40% CPU
Lower frame rate: 60fps to 30fps halves encoding load
Change Encoder Preset: x264 'veryfast' instead of 'medium' (if using CPU encoding)
Downscale Filter: Settings > Video > Downscale Filter > 'Bilinear' (fastest)
Close background apps: Chrome, Discord, Spotify, unnecessary programs
Disable browser hardware acceleration (Chrome uses GPU needed for encoding)
Game settings: Lower game graphics quality to free up CPU/GPU
Set capture software process priority: Task Manager > Details > Right-click OBS > Priority > High
Windows: Disable Game Bar, Game Mode, and Geforce Experience overlays
Pro Tips
- Hardware encoding is THE solution - if you have NVIDIA/AMD GPU, always use it
- Single PC streaming is CPU-intensive - dual PC setup eliminates all CPU issues
- Recording to disk uses less CPU than streaming (no real-time encoding)
- Monitor both CPU and GPU usage - GPU encoding can hit GPU limits
- 12th gen Intel or newer: Use QuickSync - quality rivals NVENC with lower power
Related Guides
Resolving 'No Signal' Issues with HDMI Capture
Complete troubleshooting guide for 'No Signal' errors with Magewell HDMI capture devices. Step-by-step diagnostics and solutions.
Fixing Audio Sync Issues in Video Capture
Diagnose and fix audio delay or lip-sync problems in your video captures. Audio sync offset configuration for OBS, vMix, and other software.
USB Bandwidth Issues and Solutions
Troubleshoot USB bandwidth problems causing dropped frames, stuttering, or device not recognized errors. Multi-device USB management.
Capture Device Not Recognized by Computer
Fix device detection issues when Windows or macOS doesn't recognize your Magewell capture device. Driver and USB troubleshooting.