From the Dynamo forum:
[UPDATE August 3, 2017] Version 0.3.1 is now available!
In addition to some minor bug fixes and improvement, the biggest change in version 0.3.1 is that preview geometries are now rendered more efficiently. We no longer needs to rely on Periodic update mode as in the previous version. This allows for a more responsive display and manipulation, especially in scenarios with high numbers of nodes.