X-Plane 12
Laminar Research Ships X-Plane 12.3.0 with Vulkan Memory Overhaul and New ATC Logic
By Rachel Morrison · · 2 min read
X-Plane 12.3.0 is now live, bringing a rewritten Vulkan memory allocator, improved ATC vectoring, and updated default 737-800 avionics. Laminar says the update reduces VRAM pressure by up to 18% in dense urban scenery.
Laminar Research has released X-Plane 12.3.0, and the headline change is internal: a rewritten Vulkan memory allocator that the team says cuts VRAM pressure by up to 18% in dense urban areas like New York or London. For simmers running 8GB cards at 1440p, that headroom translates directly into fewer texture pop-ins on final approach.
The ATC engine has also seen meaningful work. Vectoring logic now respects published STAR altitude constraints more strictly, and the controller will no longer clear you below the MSA when terrain is a factor. Laminar has also added basic RNAV (GPS) approach support for default airports, though it's still limited to LPV minima — no RNP AR yet. The default Boeing 737-800 got an avionics refresh, with FMC performance predictions now accounting for assumed temperature and improved VNAV path smoothing on descent.
Third-party developers will want to note the updated SDK: the new datarefs for hydraulic and electrical bus states are now documented, which should simplify systems depth for study-level add-ons. ToLiss has already confirmed its A340-600 will leverage the new datarefs in an upcoming patch.
12.3.0 is a free update for all X-Plane 12 owners. Laminar is targeting a 12.4 release later this year with further weather engine refinements.
Tags: Laminar Research, X-Plane 12, Vulkan, ATC, ToLiss