Thunderbird permanetly consume between 50% and 100% of one proc when idle

[pouns]

The problem occurs under an up-to-date ubuntu 18.10.
On this system, thunderbird use more 50% of one core permanently.
I have deactivated all supplementary modules and get the same results.

package version : 1:60.2.1+build1-0ubuntu1

My expectation is to have an idle thunderbird consuming less than 5% of a core, as it used to, and so save my battery life.

[pouns (pouns1)]

Sorry, I have found the problem. Thunderbird was not idle, it was downloading a large imap account since 15 days :)
I close this bug.

[pouns (pouns1)]

wrong analyse of the problem