OBsIV confirmed that PS5 wired to PC wired input over Remote Play is < 1ms roundtrip, so lag is not an issue over gigabit ethernet. If Remote Play input is lagging, check your setup.
PC or Mac PS Remote Play app is much simpler to use, but it's not quite as responsive as Beloader. Input lag can be 20-80ms, if Od1n's measurements are correct. Honestly, it feels really good most of the time, despite those ping spikes.
So what is right now?
I strongly assume that it is your second statement.
This is consistent with my experience of input lag.
(but please then correct the Post 1 in this thread)
Funny thing, I said it from the beginning in this forum. I wrote it was never a solution to use remote play because the input lag is way too big to keep up with competitive first person shooters.
(for example, see this post:
https://community.xim.tech/index.php?topic=95718.msg850893#msg850893)
I wasn't listened to back then, I was just told it was because of my setup.
nice that someone from the "staff" team of XIM has noticed it now: Input lag is very noticable
Remote play has NOT been a solution for PS5 players, at least not if you want decent response times.
I also stopped playing in the meantime, after almost 8 years of XIM, because there is simply no PS5 solution from the team and until today only a slow remote play solution is available. Too bad.
I know it's not your fault, no one has found the solution yet. But I have the feeling that this remote play solution was presented as too positive from the beginning here - there are clear disadvantages, at least with the setup (all wired, gigabit ethernet), which is mentioned here in post 1.
I just wanted to continue to emphasize: Remote Play (via desktop app on PC) is not a solution. I will try the Raspberry Pie solution next (hopefully).
Maybe then I'll get my fun (shooter) gaming back.