Performance of an openEHR based hospital information system

•Hospital information systems could benefit from using openEHR in terms of interoperability and security of medical data.•openEHR standard can be applied in wide variety of medical information systems.•The use of openEHR implemented as an additional server for medical data may result in lowered performance of the system.•An architecture of an openEHR based system must take into account additional overhead in fetching medical data.