search in large MS-Exchange environment renders eM Client unusable

I’m evaluating eM client with MS Exchange. Search is causing eM client hung when I type one letter in search box, either quick search or search dialog.

Is there a way to disable automatic search when typing?
I believe my issue comes from large addressbook (several hundred thousand records)

Otherwise, your product feels superior compared to Outlook. I’m from MacOS background and your approach feels much more friendly to me than MS one.

Best regards,
 -jla