Latency and packet loss

DrHolloway4​ thanks for the screenshot. The 3 yellow rectangles in the top left corner of the screen indicate the frame rate is below 60 frames per second. 

Client frame time (CFT) is 20ms which means the PC's framerate is 50fps.

1,000ms ÷ 20ms = 50fps

There's 1,000ms in one second. The PC is outputting a new frame every 20ms 

Most likely the CPU is hitting 100% usage on one of the cores. Here's some troubleshooting steps to verify if this is indeed what's happening.

To check if there are any CPU cores hitting 100% usage, open the Windows Task Manager CPU graph.

• Run the game in windowed mode (alt + enter)
• Open Task Manager (alt + ctrl + del)
• Open the Performance tab, then right-click on the CPU graph and choose "Change graph to > Logical processors".
• Set Task Manager to 'always on top' by clicking option
   
  Now you can play the game and monitor per core CPU usage. If any CPU core hits 100% usage the game will stutter and cause network lag.

Battlefield 6 is designed to run at 60fps or higher. If the fps drops below 60 then time nudge (TN) will spike up high.

The next step is figuring out what's causing the CPU to max out.

If the CPU is above recommended system requirements but still has CPU cores hitting 100% usage.

Then possible reasons include:

• CPU frequency downclocking due to the CPU or motherboard voltage regulator module (VRM) overheating.
• RAM in single channel mode, instead of dual channel mode.

Monitor CPU frequency in Windows Task Manager to see if it downclocks. For example going from 4GHz down to 3Ghz.

Download HWiNFO to see if the CPU or VRM is overheating and causing the CPU frequency to downclock.

The CPU shouldn't be above 80°C and the VRM shouldn't be above 90°C.

https://www.hwinfo.com/

Download CPU-Z to see if RAM memory is in dual channel or single channel mode. Dual channel has more performance.

https://www.cpuid.com/softwares/cpu-z.html