Hello Paul,
Thanks for your help and patience.
I tried with r- Q but same issue, emacs freezes when I start editing the file (I can open it but not modify its content), For this test, the file is stored locally (no remote cifs access, no encryption),
I do not have the problem with encfs on a local directory, only when the encrypted directory is stored on another server accessed with cifs. I do not have any problem with a remote directory accessed with cifs it if is not encrypted (I only have the issue when I use an encrypted directory with cifs).