It happens regularly that I click on the 1Password browser extension icon in my Firefox and it takes several seconds for it to show the menu. Sometimes it's 1 or 2 seconds, other times it can go up to 10 seconds.
Most of the time though (80%+), especially when it was already opened recently, it shows within a second.
It still works, but it's annoying. It's been happening for well over a year. The amount of time is limited, but if you add it all up, I wouldn't be surprised if it's over an hour of waiting per year. Not including the wasted time because of lost attention.
1Password Version: 220.127.116.116 (24)
Extension Version: 18.104.22.168 (Mozilla Firefox)
OS Version: 6.2.9200
Sync Type: Vault in Dropbox