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# 11 Upgrade notes for 6.0.1

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##### Configuration syncer

Performance of the configuration syncer has been improved. 
It is recommended to increase the CacheSize on server/proxy 
if there is a large amount of templates. It is also recommended 
to remove unused templates.

Note that the default CacheSize on server/proxy has been increased 
to 32M.

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#### Item changes

 Native support for the [items](/manual/config/items/itemtypes/zabbix_agent) **net.dns** and **net.dns.record** has been added to Zabbix agent 2. On Zabbix agent 2 for Windows, these items now allow custom DNS IP addresses in the `ip` parameter and no longer ignore `timeout` and `count` parameters. 

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