A few months ago, I wrote about [setting up an OpenVPN server on Windows](https://www.michaelcheng.us/stuff/40). I was mainly using this to VNC to my workstation, and I noticed some pretty poor performance occasionally. It wasn't that the connection speed was slow -- it was actually dropping the connection almost every minute or so. At first, I decided that it was the WiFi network I was on. Maybe there was congestion. Or maybe OpenVPN on Windows is just bad. After some research, I found that the problem may have been an incorrect MTU ([maximum transmission unit](https://wikipedia.org/wiki/Maximum_transmission_unit)). According to Sonassi's [knowledge base](https://www.sonassi.com/help/troubleshooting/setting-correct-mtu-for-openvpn), symptoms of incorrect MTU include:

I recently acquired the [Amazfit Bip](https://en.amazfit.com/bip.html) "smart" watch. It is a solid improvement over the Mi Band 3, but there are many quirks that remind you that you're using a ~$70 device rather than a real smart watch.