Ok ! I found something !
Thanks for your question “What has changed?”
Effectively, recently, one month ago I think, I reinstalled my SMTP server, so I tried something : send a message with telnet and this smtp.I noticed that it was taking a few seconds to accept sender and recipient address : The first DNS server on this machine was invalid.
Once the DNS server has been corrected, new calendar event are saved in “few” seconds, instead of minutes…
GREAT !
BUT, I’m really surprised…this emails should be sent async, many problems can occur and shouldn’t block the GUI .
Furthermore, the freeze is directly dependent of the number of participants,even if emails are sent quickly.
However thank you for this program, it’s a beautiful work.