Thanks Chris. I will try that out. Other than that I was able to run HTTrack after I had installed httraqt GUI from AUR.I cannot really say if it is a required dependency or not but at least it is working as expected.
Extensions? Any other info/configuration we shoudl know about here?Good point! Indeed the lags were caused by an extension called Recent Tabs. Yet I did not think of an extension issue before since I use the same extension on Windows where it never had caused any issues.