My Framerate in Singleplayer is fine at 50-60 fps (as limited in AMD driver) but my lows while moving sit at 9 fps and as low as 1
A new Empty world does not change the behaviour.

Setup:
Ryzen 5 5600X no OC
16 GB Ram stable OC(Passmark Memtest86, Prime95) at 3600 16-18-18-20-36
RX 6800 XT Driver: 21.12.1

ATM6-sky Version 1.1.9

Taskmanager and AMD Software show low usage of GPU and CPU
I have disabled Mipmap and Texture Animation.
8192 MB of RAM are allocated
Java Additional Arguments:
-XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true

Adding and removing Optifine had no influence.
I have tried current Java 17.0.1.0

Spark log in my World:
https://spark.lucko.me/r2ePeFB2Y9
Spark log in New, Empty World:
https://spark.lucko.me/tr0AzEnHAp

might sound completely stupid but have you tried it without java args, and with java 16?

accidental close

might sound completely stupid but have you tried it without java args, and with java 16?

Did that and nothing changed at all

i have no clue, i am full AMD myself and have issues, but there isnt really a way to fix them which is unfortunate, MC hates AMD :(