Question / Help My lag free settings suddenly laggy

[Fluffyrox4]

I did a recording yesterday and it was fine, but I did one today and the output is laggy.

Log file:
https://gist.github.com/9422e38faebc392e96e3a26b2442d8d9

My settings:
Format: mkv
Audio track: 1,2,3
Encoder: x264
Rate control: CRF
CRF: 20
Keyframe interval: 0
Usage Preset: superfast
Profile: High
Tune: none

Please bear in mind that these are the exact same settings I used for the good recording.