A770 Fortnite low FPS

Hi. I just bought ACER Intel® Arc™ A770 16 GB Predator BiFrost OC and I get very low FPS in Fortnite.

On Epic settings with Lumen and Nanite on I will get max 20FPS at 1080p

When I go to medium/high settings with Lumen and Nanite off i will get 45-60FPS max.

I have Ryzen 8600G with integrated GPU and when I had no dedicated GPU I could run Fortnite easily on same settings with 60FPS now with A770 is actually worse. I've seen YT videos and i believe this card should pull about 50-60FPS at max possible settings? But not definitely 20FPS ?

CPU: 8600G (integrated GPU turned off in BIOS now)

RAM: ADATA 16GB 5600MHz DDR5

MBO : Gigabyte B650M K

GPU driver most up to date from Intel.

I've removed all AMD drivers with AMD Cleanup Utility then run also DDU just to be sure.

Integrated GPU switched off in BIOS. Reinstalled Fortnite. ReBAR is Enabled(checked with GPU-Z)

When I play GPU usage is showing 100% but VRAM it is about 5-6GB max ?

Other games I've tried like PUBG or CS2 running absolutely fine. I don't know FPS from PUBG but runs smooth like butter at all settings maxed out and CS2 runs over 60-70FPS at max settings.

I've created a new topic as there are few old ones referring to old drivers and they are somehow obsolete.