There were over 200 people in Limsa. I dropped to around 45 fps. But I also play at 3440x1440.
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FFXIV is amazing in Arch Linux, unfortunately we still face some issues related to launcher version. The modern launcher from ShB doens't run, instead, you need to use the classical one.
Performancewise it'll be surprisingly good for FFXIV imo. The CPU cores are all on the same CCX and with a unified cache which will help things, whilst the RDNA2 IGPU side of things coupled with the fast ram should be surprisingly capable.
By comparison my HP zbook x2 tablet could run medium/low at 30-60 fps at 1080p comfortably anywhere except super crowded areas where the visible player cap would get hit. That was with a U series quad core i7 and a fairly meagre Maxwell era Quadro. The Steamdeck obliterates that in GPU performance.
Performance in huge crowds could go either way though. This game can get highly bound by a single thread in busy areas and performance in these situations was always disappointing on a 3800x (switching to a 5800x saw an uplift of over 50% outside the Bozja entrance at peak hours for me). This side of things will depend on how well the Deck can allow it's CPU to boost up under a predominantly single thread workload but with light usage on the other cores. My Tablet coped surprisingly well for about a minute in these crowds with the CPU pushing north of 4.5ghz for a period, but it couldn't sustain that for long and performance would quickly tail off pretty severely after a time.
I'm sure it'll run fine - Valve are working hard to make sure the whole library works by the time it launches - you can run the SE version too (not just Steam, SteamOS is just the OS).
I'm hyped my 300+ Steam games will be available on launch, ironically, my 2 copies of FFXIV are on PC (non-steam) and PS5, so i'll just be installing the normal version, might donk W10/11 on if required.