It still does not always autofill upon double click on the first try. This happens with all websites not any specific ones. I see it on both Safari and Firefox. After I have managed to get a successful autofill, subsequent attempts work immediately. After a period of time, it goes back to not autofilling on the first try. I also have noticed the extension is slow to search the vault and find the login for the website. Again, this is very slow if time has passed where I have not used Enpass. If Enpass has been recently used the extension finds logins quickly and autofills with a double click. It's like some part of the Enpass system is going to sleep and has to be wakened up to be at full function. I booted in Safe Mode and the behavior is the same.
I am using Enpass 6.7.1 (878) on a 2017 Macbook Pro running Mac OS 11.5