If you're getting an MTU: 1340 Connection type: OpenVPN TCP bs128 SHA1 lzo message on whatleaks then you'll need to change your MTU to 1310. See below for Windows and Mac instructions.
Windows : https://myrandomtechblog.com/cryptomining/change-mtu-size-in-windows-10/ and set it to MTU 1310
Mac : Open Terminal
Run this command: route get 10.10.10.10
Figure out what your interface is (ex: en2 or en5)
Then type networksetup -getMTU en# (put number of en where # is)
Then if you want to change it use command: networksetup -setMTU en# 1310 (put number of en where # is)
https://osxdaily.com/2013/01/14/set-mtu-size-from-the-command-line-of-mac-os-x/ - more information here. You want to use 1310.