Using cache will speed up the application to a great degree, we recommend to use cache for whole modules, but sometimes cache also make confuse for user, if we didn't take care of how to make cache expired when needed, such as if a data has already been deleted but the cache arn't clear, it will cause un expected errors. so you should choose a correct performance setting type when you trying to cache some stuff, and always remember update cache immediately after the data changed.

default cache policy in core api will use cache timeout muitple Host Performance setting's value as cache time(unit: minutes):

• HostSettingsCacheTimeOut: 20
• PortalAliasCacheTimeOut: 200
• PortalSettingsCacheTimeOut: 20
• More cache timeout definitions seeDataCache