Thunderbird 'freezes' when typing in an email address

I’m sure this has something to do with IMAP/LDAP settings perhaps, but every time I go to type in an email address Thunderbird hangs up for about 3-5 seconds. It hangs while typing the address, then after I finish as well for a few seconds.

I am using a corporate LDAP server, i’m guessing it’s constantly checking the server for matches on the partial address I am typing. Perhaps there is a way to turn off address checking till I am done with the email address or addresses and only use local addresses?

Using version 60.8 on Win10 64.

The only add-on or plugin I have is Lightning.

Tools > options > composition > addressing > uncheck “directory server”

I was hoping there would be a way to have it use the directory server less aggressively. Perhaps a “check names” button.

You can check addresses in the addressbook interface.

Another performance workaround is copy frequently used addresses from ldap to (local) personal addressbook. (I do this, but not for performance reasons)

You also might get some relief by reducing the default size of the query result.