Safari extension performance

In the past couple weeks, I've had increasingly bad performance by the 1Password Safari extension. The field-based dropdown doesn't...drop down. The browser bar-based icon won't open, either. I'll click on both and nothing happens. Until maybe 5 minutes later well after I've manually cut & pasted a password from the desktop app. 

Clearly the app is unlocked, but the extension doesn't reflect the same status. Most of the time it just appears frozen. Maybe eventually it unlocks itself, but by then I'm long past the need for it. This is unacceptable and really just defeats the purpose of the extension.

Of course, I've checked that I have the most recent version, I've tried killing the browser process and restarting, I've just nuked and reinstalled the extension--none of that seems to make a difference. Next time I open the browser, still the same slow performance. 

Any other ideas?

/mike