Developer reply by Philippe V.
Rated 5 out of 5 stars
Thanks Philippe for your help - problem solved.
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For anyone´s reference:
Scrolling in E-mail-list is extremely laggy.
Could trace this problem back to this Add-in because after disabling this add-on everything smooth.
Gone back to v 21.3 - everything smooth again.
Windows 10, Thunderbird 52.2.1
Love this add-on - please make it useable again. Thank you!
in Thunderbird preferences, Display tab, uncheck the last option : "Show only display name for people in my address book" ;O)
To create your own collections, you must have a Mozilla Add-ons account.