Case Study: Fixing Logic Pro CPU Overload Errors When Streaming with OBS

By Paul Andrews, Founder

The Challenge

My client, a budding content creator, wanted to build a live reaction channel for Twitch and YouTube. He invested in tools like a Native Instruments Maschine controller to use as a live soundboard for sound effects and audio clips, running alongside OBS on his 2012 iMac. We had already successfully configured the complex audio and video routing to get his browser, webcam, and microphone feeds into OBS. However, running his Maschine sound library within Logic Pro alongside OBS proved too demanding. Whenever he started interacting with the stream—like switching videos or loading new browser tabs—his Mac would grind to a halt. Logic Pro flashed a “System Overload” error, leading to stuttering audio and a frozen stream.

The Amazing Audio Solution

The problem was a fundamental conflict of resources: his older iMac simply didn’t have the CPU headroom to run two resource-intensive applications simultaneously. A Digital Audio Workstation (DAW) like Logic Pro acts like a complete, broadcast-ready television studio, which was overkill just to host a single sampler. The background processes and audio engine were consuming CPU cycles desperately needed by OBS to encode the video.

Instead of upgrading the hardware, we needed a simple, lightweight application to host the Native Instruments Maschine plugin. We swapped Logic Pro for a free micro-host utility called Hosting AU, dramatically reducing the background processing load. Here is how we implemented the stable workflow:

• Install the Micro-Host: We downloaded and installed Hosting AU, a bare-bones utility that scans the Mac for all available Audio Unit plugins and acts solely to pass audio through them.
• Load the Soundboard: Inside Hosting AU, we loaded a single instance of the Maschine 2 plugin and opened his previously created soundboard project.
• Configure the Audio Output: In the preferences, we set the audio output to the Blackhole Virtual Audio Driver, utilizing the exact same routing we used before to ensure OBS could receive the audio.

The Result

The result was immediate and profound. The Mac’s CPU usage dropped significantly, allowing the client to run his OBS stream, play multiple videos, and trigger sounds from his Maschine controller with no errors, stutters, or system overloads. By choosing a single-purpose micro-host instead of a monolithic DAW, we solved what seemed to be a hardware limitation and saved the client from spending thousands on a new computer.