Slow Upload Speed When Connecting Over LAN

This document will help you fix slow upload speeds when connecting to your BlueBubbles Server over your LAN.

What's the issue?

When sending attachments via BlueBubbles, upload speeds are incredibly slow when connected over your LAN (localhost/local IP)

What's the cause?

This issue only occurs in VMware deployments with vmxnet3 is used as the network adapter.

What's the fix?

To fix this issue, you just need to disable "TCP Segment Offload (TSO)" on your Mac.

1. Open Terminal on your Mac

2. Run the following command: sudo sysctl -w net.inet.tcp.tso=0

3. Create the following file (if not created): /etc/sysctl.conf

4. Add the following line to the sysctl.conf file: net.inet.tcp.tso=0