Used a metronome with 40bpm 4/4 simple eighth note subdivision

Yes, the lag you see is in real time, not from badly configured software.

Running daily challenge course 463

Metronome I used:
https://soundbrenner.com/the-metronom...

Recorded using "SimpleScreenRecorder"
https://www.maartenbaert.be/simplescr...
https://github.com/MaartenBaert/ssr
https://archlinux.org/packages/commun...

Video editing done with "KDENLIVE"
https://kdenlive.org/
https://github.com/KDE/kdenlive
https://archlinux.org/packages/extra/...

Fabric mods I used for performance:
https://github.com/CaffeineMC/sodium-...
https://github.com/CaffeineMC/lithium...
https://github.com/Noxcrew/noxesium
https://modrinth.com/mod/fadeless
https://modrinth.com/mod/exordium
https://modrinth.com/mod/immediatelyfast
https://modrinth.com/mod/entityculling
https://modrinth.com/mod/ferrite-core
https://modrinth.com/mod/modernfix
https://modrinth.com/mod/sodium-extra
IMPORTANT NOTE: Exordium + ImmediatelyFast cause me a few problems, if you're getting crashes, it's probably because of this combination, if so, I recommend using only one of these.

Specs:
CPU: AMD E1-6010 APU with AMD Radeon R2 Graphics (2) @ 1.350GHz
GPU: AMD ATI Radeon R2 Graphics
Memory: 7740MiB
Running a dual boot of "ArchLinux" and "Windows 8.1 Pro N"