Search for users with the line "share"

Hello! Very slow search for users in the "share" line. LDAP is installed, users from Active Directory

Actual behaviour
Very slow search for users in the "share" line. LDAP is installed, users from Active Directory

Server configuration
"user_ldap" 0.8.0
Operating system: Ubuntu Server 15.10
Web server:Apache/2.4.12
Database:mariaDB 10.0.25
PHP version:PHP 5.6.11
ownCloud version (see ownCloud admin page): ownCloud 9.0.8 (stable)
Updated from an older ownCloud or fresh install:
Special configuration (external storage - nas, external authentication- ldap, reverse proxy - no, server-side-encryption-no):