Slow Internet on 2016 13" MBP

[thealexo_o]

Hey, so I have a 2016 13" MacBook Pro running on Sonoma 14.4 using OpenCore Legacy and I recently noticed, that I don't get the full bandwidth on my MBP. I used to have full speed (1000 Mbit/s), but now it's just arround 200-300 tops. The upload is unaffected, I get the full 50 Mbit/s. It's just my MacBook, because my PC is unaffected. I've tried a different cable, different Ethernet adapter even, but nothing helped. I haven't changed any router settings that could affect this, and as I said, I used to have the full bandwidth a while ago (also on Sonoma) I just didn't notice when it started to cap it...

iperf shows a good connection to my router I guess, but I don't even get those DL speeds..

Here is the DL Speed when on WiFi (it's on 5GHz Network so it definitely should be faster)

And for comparison a wired speedtest:

The network settings also look good, with the full duplex and 1000baseT

Cisco AnyConnect used to throttle my connection with its horrible filters, but I've uninstalled them and the issue was resolved until now(I just noticed it so not exactly now now). I don't remember installing any software that could filter/throttle the connection like that... anything I can try to figure it out and hopefully fix it?

Thanks in advance!

 

[Bigwaff]

Open Terminal and execute

networkQuality -sv

and post the "Verbose Results"

 

[thealexo_o]

Open Terminal and execute

networkQuality -sv

and post the "Verbose Results"

Here are the results:

==== Verbose Results ====
---
Capacity:
---
   Uplink capacity: 49.279 Mbps
      Accuracy: High
      Uplink bytes transferred: 114.170 MB
      Uplink Flow count: 16
   Downlink capacity: 435.983 Mbps
      Accuracy: High
      Downlink bytes transferred: 621.752 MB
      Downlink Flow count: 15
---
Latency:
---
   Idle Latency:
      1836 RPM (32.667 milliseconds)
         Transport: 2232 RPM (26.875 milliseconds)
         Security: 1206 RPM (49.750 milliseconds)
         HTTP: 2807 RPM (21.375 milliseconds)
      Accuracy: High
   Uplink Responsiveness: Medium
      387 RPM (154.956 milliseconds)
         Transport: 2136 RPM (28.082 milliseconds)
         Security: 1411 RPM (42.520 milliseconds)
         HTTP: 3754 RPM (15.980 milliseconds)
         HTTP loaded: 196 RPM (304.859 milliseconds)
      Accuracy: High
   Downlink Responsiveness: Medium
      733 RPM (81.844 milliseconds)
         Transport: 1628 RPM (36.837 milliseconds)
         Security: 1040 RPM (57.663 milliseconds)
         HTTP: 2194 RPM (27.337 milliseconds)
         HTTP loaded: 562 RPM (106.612 milliseconds)
      Accuracy: High
---
Protocols Used:
---
    HTTP/2: 100%
---
Transport-layer info:
---
    ECN Disabled: 100%
---
Other Info:
---
   Test Endpoint: defra1-edge-bx-001.aaplimg.com
   Interface: en12
   Start: 2024-03-15 08:18:21.572
   End: 2024-03-15 08:18:55.964
   OS Version: Version 14.4 (Build 23E214)