In the sample of Wunderlist Template PowerApps, it looks like PowerApps programability can lead to show items related to a record, but that is exteremily slow, and looks ugly. PowerApps need Related-Items Control simiar to MS Access.

In the sample of Wunderlist Template PowerApps, it looks like PowerApps programability can lead to show items related to a record, but that is exteremily slow, and looks ugly. PowerApps need Related-Items Control simiar to MS Access.
Performance of PowerApps with CDM is good compared to other connections example: sharepoint list. The reason might be CDM is the first class storage choice for PowerApps and for others PowerApps needs to interact with other systems and those may also impose some delay.