System information:

Number of hosts: 5450

Number of items:1050243  ;Number of triggers:563019

new values per second: 10555.39

zabbix-server.conf

LogFile=/var/log/zabbix/zabbix_server.log
LogFileSize=100
DebugLevel=3
PidFile=/var/run/zabbix/zabbix_server.pid
SocketDir=/var/run/zabbix
DBHost=X.X.X.X
DBName=zabbix
DBUser=zabbix
DBPassword=******
HistoryStorageURL=http://ZabbixDataElasticsearch.XXX.com:9200
HistoryStorageTypes=uint,dbl,str,log,text
StartPollers=270
StartPreprocessors=10
StartPollersUnreachable=5
StartTrappers=80
StartPingers=360
StartDiscoverers=8
StartHTTPPollers=8
StartTimers=700
StartEscalators=20
StartAlerters=5
SNMPTrapperFile=/var/log/snmptrap/snmptrap.log
HousekeepingFrequency=0
MaxHousekeeperDelete=0
CacheSize=3G
CacheUpdateFrequency=320
StartDBSyncers=60
HistoryCacheSize=2G
HistoryIndexCacheSize=900M
TrendCacheSize=200M
ValueCacheSize=5G
Timeout=6
AlertScriptsPath=/etc/zabbix/alertscripts
ExternalScripts=/etc/zabbix/externalscripts
LogSlowQueries=2000
AllowRoot=1

can you help me ? I'm crazy！！！！ 

For example：

I‘m create one maintenance at 16:30  .Active since: 2019-11-16 16:30,Active till:2019-11-16 16:40 。

But ,I have to wait more than 3 minutes for the host to enter the in maintenance mode ，

At 16:34, the host status changes  in maintenance。

This is not an individual phenomenon. I tried many hosts。
 
maintenance