Switch OLED extremely slow when game launched

Hi all,

received NS Oled for repair with strange problem. It works extremely slow when any game is launched, at first it will hang on black screen, after few minutes games launches but any key input takes up to minute to respond. Although, when not in game, GUI seems to be working fine without lag. it was on firmware 16.0.3, I’ve updated to 17.0.0, done factory reset but still same. So thought it might be eMMC issue so I’ve modded with HWFly to check how it runs with emuMMC. And gues what? It still has same lag when starting game. It’s not thermal issue as i’ve replaced thermal paste with MX-4. Any advice would be appreciated. Thanks

hekate Emmc speed test?

314-330 MiB/s