Thunderbird beachballs 5-25 seconds after opening.
This happened both on my old install of macOS Ventura as well as a clean fresh install of macOS Sonoma: When I open Thunderbird, it beachballs (is unresponsive, shows macOS beachball, fan ramps up) for anywhere between 5-25 seconds. This only happens when an account is set up, if I delete the account, Thunderbird starts quickly again. This happens with accounts from different providers.
Details: 115.7.0 (64-Bit) (happened with older versions as well) 2019 16" MacBook Pro 2,3 GHz 8 Core i9 32GB Memory 1TB Storage macOS Sonoma 14.3.1 (happened with Ventura as well)
Modified