Exchange Control Panel painfully slow to load users list

Hi all,

For several days, when I attempt to access ECP 2010 SP3, IE is painfully slow to load users list. So this tool becomes inoperable.

When I sign in, I have to wait several minutes before ECP shows users list. And when I attempt to select a user to manage, the users selection window is equally painfully slow for showing users list.

This issue occurs from a remote IE or from the Exchange server itself. I tried various URL, but without success (https://FDQN_external/ecp,https://FQDN_internal/ecp ou  https://localhost/ecp).

Thank you for your help.

FXE