Message move sometimes work very slowly

[markozgemini]

Hi,

I am using the latest version, i.e. 5.5.0.

I process a lot of messages from several mailboxes. All of them are Microfost and connected via oAuth.

My flow looks like this: I check if there is a new message in the inbox folder, if so, I download the attachment to my system and process it. At the end, I mark the message as read and move it to the folder:

$mail->addFlag('seen');
$mail->move('archived');

Unfortunately, sometimes I have situations where the transfer to another folder itself takes a very long time, currently on one mailbox it takes about 40-45 seconds to transfer one email. On another mailbox the same process takes about 7 seconds. I assume that there is a similar number of messages on both mailboxes, but I don't know how to check it.

Does anyone of you have an idea where such a big difference in transferring messages could come from?