I'm so sick of AT Arkveld because of lag

Look, I love this game, I'm at 300 hours now, and I have I think 80 kills on Arkveld, generally 9 and 8 star. But this fight is pissing me off so much. I've wasted probably a few hours now doing it. I killed it once, but because the fight is just so long, my game lag wins over me. I'm away from home, I'm living somewhere else from the Ps5 I use to play, and generally I'm on a playstation portal. My connection usually is fine, it's stable enough to still do challenging fights (e.g. Consort Radahn in Elden ring) but for some reason I always get at least a few spikes during AT Arkveld. I get the odd spike on normal fights, but usually it's fine since it leads to maybe one or two carts at worst. Since this fight is so long though, I just keep getting into the situation where I'll have a momentary spike and he has 2 tapped me. He does so much damage which obviously doesn't help since he can kill me so quickly when the spikes do happen. I'm just so sick of this fight, I was so excited for it when it came out and I do rly enjoy the move set, but god this is so frustrating. I've never had this issue in the games before, the worst was Fatalis in world but that was fine since you have more carts available and I can run World on my Steam deck so I don't get lag spikes. I can't run wilds on anything but my at home ps5 so I'm just stuck trying to beat him through the lag.