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Constant lag spikes every minute ONLY on MW3 (PS5, 500Mbps AT&T Fiber)… tried everything and losing my mind

So I hopped back on Modern Warfare 3 a couple of weeks ago for the first time since launch week… turns out I actually really like the game now and I've been grinding it non-stop. But I’m at my absolute limit with this lag and I’m ready to just delete the entire game.

Here is the weirdest part: MW3 is literally the ONLY Call of Duty on my PS5 that does this. Every other CoD plays completely smooth without a single hitch. But on MW3, every minute or so, I get these random, aggressive lag spikes out of nowhere. My ping is normally totally fine, and my speed tests on the PS5 consistently hit around 500 Mbps down.

Before anyone suggests the basic troubleshooting steps, here is everything I’ve already done:

  • AT&T came out: I literally had AT&T check out the modem and line, so the hardware setup is good on their end.
  • Network tweaks: Locked on 5 GHz, and I’ve already manually configured my PS5 network settings with a manual IP, custom DNS, subnet mask, gateway, all of it.
  • In-game settings: I set On-Demand Texture Streaming to minimal, which is as low as PS5 lets you put it.

There are no warning icons, I don’t even get packet loss or packet burst icons popping up on screen… it just hitches and lag spikes randomly during matches.

I have tried every fix under the sun and nothing works. I really want to keep playing because I'm genuinely having a blast with the game these past two weeks, but losing gunfights to constant stuttering is making it unplayable.

Has anyone on PS5 or AT&T Fiber run into this exact MW3-only issue and actually found a way to fix it? Desperately need some help here.

Source: r/ModernWarfareIII · by /u/yazansta

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