> For the complete documentation index, see [llms.txt](https://docs.bluebubbles.app/server/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bluebubbles.app/server/troubleshooting-guides/slow-upload-speed-when-connecting-over-lan.md).

# 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`


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