Heavy lag on PS5 despite all issues resolved on my end

Hello. I am really fed up with the game lagging all the time. I bought a new PS5, upgraded my internet to the best internet in Switzerland but, the game still heavily lags. My internet is good connected with Ethernet, my ping is always below 20, but the game lags badly still. Even the menu is lagging. The same issue I had with FC26 on a different PS5.

Below is the whole description of my issue, as I tried to communicate with EA chat this issue many time, they just send me to the pages that are not helpful and completely useless.

Subject: EA SPORTS FC 27 (PS5) - persistent menu and gameplay lag that points to the game, despite new console and upgraded internet

Platform: PlayStation 5 Digital Edition (Slim)

Game: EA SPORTS FC 27 (also affects FC 26)

Modes affected: all menus, Squad Battles, FUT Champions

Region: Geneva, Switzerland

PROBLEM

The game starts out fine, but within a few minutes the menus become laggy and stuttery. This happens in the menus themselves, not only during matches, and it is worst in FUT Champions. The same problem occurred in FC 26.

WHAT I HAVE CHANGED WITHOUT ANY IMPROVEMENT

- I bought a brand new PS5 Digital Slim. The problem also happened on my previous PlayStation, so it is not tied to one console.

- I upgraded my internet to the highest tier available (Init7 Fiber7), and the problem did not change.

KEY OBSERVATION

The PS5 home menu and system UI are completely smooth, including right after I quit FC 27. The lag only appears inside FC. Given that two consoles, two game versions and a much faster connection all show the same behaviour, this points strongly to the game or EA's online services, not to my hardware or network.

NETWORK (ruled out)

- Wired Ethernet connection to the PS5

- About 909 Mbps download and 60 Mbps upload on the PS5 connection test

- Ping consistently under 20 ms

- NAT Type 2

- Internet connection test passed in full

- EA's in-game Connection Quality report shows no problems, even while the menus are lagging badly. So the connection quality is not the cause.

TROUBLESHOOTING ALREADY DONE

- Cleared the cache and rebuilt the database in Safe Mode

- Set the console to performance mode

- Wired controller and headphones

- Changed video settings as recommended

- Output set to 1440p (the monitor's native resolution), 120 Hz output off, VRR off, HDR off

- Tried both HDMI ports on the monitor

- Display: HP OMEN 27q G2 gaming monitor, which is fine in the PS5 home menu

- Router (Zyxel EE5301): checked QoS and NAT settings

- The support articles I was pointed to did not apply to this issue or fix it

- Changed the PS5's DNS to 1.1.1.1 / 1.0.0.1, no improvement.

WHAT I NEED

Please investigate whether there is a known performance or menu issue on PS5 in FC 27 and FC 26, and let me know if a fix or patch is planned. It’s really frustrated and I’m completely fed up with the way I’m being treated by EA.

Thank you.