Spatial announced today the release of the Thread-Safe ACIS Modeler.
To sum up why this is so exciting, developers can now use ACIS to take full advantage of multi-core hardware. The modeling operations show near linear scaling. This not only means potential for performance gains on current hardware (once this release of ACIS gets implemented into your solid modeling software), but also allows for growth of future hardware upgrades.
And if we know anything about the consistency of the industry, this announcement means that Parasolid is not far behind.