Coming in Fall 2019 release, Pulsar will have the ability to calculate roll-up summary fields offline.
You will need to have a minimum release of 2.3.x of the PulsarSettings AppExchange package.
Pulsar Settings
- pulsar.layout.enableRollUpSummaryFields
Limitations of offline Roll-up Summary Field processing
- Currently, validation rules on master objects are not triggered
- Due to processing contraints in the mobile environment