TIP: Pay attention when use caching display methods on forms

A tipical performance tip is to put all display methods on datasource cache:
https://msdn.microsoft.com/en-us/library/aa596691.aspx

Using something like that on init method of datasource
this.cacheAddMethod(tableMethodStr(CustTable, Name));

Pay attention, the value of all cached methods is set when data is fetched from the back-end database. If you put a display method on a separated tab, not vibile when the form is opened, the method is called the same for each record of datasource when form start, causing a performance problem if the display method is complex. If you remove the method from the cache the display method is called only when the control appears to the user.

Than, add the method cache only if the control is visibile to the user into the main grid or main tab, otherelse assessed whether the performances have a real advantage.