# Block Data Sharing Performance [GstarCAD 2017](Help%20System/GSTARCAD/2017/Index.md) → [What's new](Help%20System/GSTARCAD/2017/What's%20new/(What's%20new).md) → [Additional Pages](Help%20System/GSTARCAD/2017/What's%20new/Additional%20Pages/(Additional%20Pages).md) ## Block Data Sharing Performance With previous GstarCAD versions, if a drawing contains a lot of block reference objects, the drawing open speed performance was very slow because those objects store their display data individually, thus data processing and memory usage was very big. In GstarCAD 2017, Block Data Sharing technology is adopted to drastically reduce data display processing and memory usage. If a drawing contains a lot of same block references, only 1 copy of display data is needed for each type of block reference. It significantly accelerates the display speed, allowing fast result when opening drawings, thus guarantees better operability of these objects. **** **** --- Gstarsoft Co.,Ltd