I have:
Number of hosts (monitored/not monitored/templates) 10741 10674 / 0 / 67
Number of items (monitored/disabled/not supported) 29298 26443 / 1929 / 926
Number of triggers (enabled/disabled) [problem/ok] 21376 20669 / 707 [2774 / 17895]
Number of users (online) 169 25
Required server performance, new values per second 1184.6
Maps - 175

When Super-Admin user opens the map, it opens in 1-5 sec. But Non-Super user opens the same map, it opens about 300 sec.
I think, zabbix check every host to access for Non-Super-Admin users. The same problem was ZBX-4917. But there was old zabbix version 1.8.