Horrible ping / rubberband in open world / dungeons

My ping on speedtest: 30ms, 1ms jitter

My ping on other games: 35-40ms stable

My ping on Diablo 2 Resurrected: 40ms

My ping on Diablo 4 in open world or dungeons: 500-1500ms

Checked RAM, CPU, GPU, no issues so far, used under 50% so no peaks.

Lowered all specs ingame from high to low, no changes.

Disabled all AI effects, no changes.

Please support, I’ve seen on Reddit many people experiencing this since Season 11 and it’s literally unplayable.