28 hours ago
I've noticed recently that my Terminology terminal emulator lags when I open it up. It takes about 10 seconds to open a new window after I launch. Once it's open however, I don't notice any lag.
I am running Terminology 1.7.99 on Ubuntu 18.04LTS with fish shell. I haven't installed updates recently as far as I know.
13 hours ago
Check any RC files that are loaded. In bash this is .bashrc or similar, so I guess look for .fishrc or similar. Any of those that contain expensive commands is likely the culprit.