19:37:05.574: Windows Version: 10.0 Build 17134 (revision: 590; 64-bit)
Windows is out of date and Game Mode is on by default and cannot be switched off. This feature negatively impacts OBS performance. Check the link below this post for info on updating and/or turning this feature off.
19:43:52.674: Output 'simple_file_output': Number of lagged frames due to rendering lag/stalls: 6469 (64.4%)
Significant GPU overload. Some of this may be due to Game Mode being on, but almost certainly not all of it. Check this page for tips on resolving this issue.
GPU Overload Issues
19:43:52.702: Video stopped, number of skipped frames due to encoding lag: 4599/9541 (48.2%)
You are also overloading your CPU during encoding.
General Performance and Encoding Issues
You may wish to consider targeting 720p as a resolution instead of 1080, especially if you are recording high motion content.