Computer lagging when OBS is open

1. Run OBS as Admin. Right click on the shortcut, properties, advanced, check box, ok, apply, ok.
2. Record to MKV or FLV. If you record to MP4 or MOV and the recording is interrupted, the file will be corrupted and unrecoverable.

If you require MP4 files for some other purpose like editing, remux them afterwards by selecting File > Remux Recordings in the main OBS Studio window or enable Auto Remux in the Advanced Settings.
3. If your source is something that uses the GPU (such as games), uncheck the box for Psycho Visual Tuning.
4. Build your scene with Game/Window/Video Device Capture etc. Display Capture is the last resort.
 
1. Run OBS as Admin. Right click on the shortcut, properties, advanced, check box, ok, apply, ok.
2. Record to MKV or FLV. If you record to MP4 or MOV and the recording is interrupted, the file will be corrupted and unrecoverable.

If you require MP4 files for some other purpose like editing, remux them afterwards by selecting File > Remux Recordings in the main OBS Studio window or enable Auto Remux in the Advanced Settings.
3. If your source is something that uses the GPU (such as games), uncheck the box for Psycho Visual Tuning.
4. Build your scene with Game/Window/Video Device Capture etc. Display Capture is the last resort.

I have followed your steps and I am still facing the same issue. Also I only use the Display Capture anyway.
 
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