Calendar lookup performance very slow

[Mondane]

I have linked the plugin to Office365

When I invite attendees to my calendar event, a lookup is performed for that attendee. The status bar shows around 40 queued jobs at that time. Each time I type in a new user, jobs are added (around 20) and after selecting a name, again ~40 jobs are added. This makes inviting attendees a very long and annoying process.

As a test I installed Hiri, https://www.hiri.com/ , and noticed an almost instant update of attendee information for events.

Could this be investigated to have the same performance in Thunderbird?