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Prepar3D crashes when flying
Prepar3D can crash when it is paging terrain. This is a CPU threading issue that can be overcome by customizing CPU core usage. P3D v5.3 added job scheduler that can be used to achieve this:
https://www.prepar3d.com/SDKv5/prepar3d/getting_help/advanced_configuration.html#JobScheduler
You can find additional information about the topic from this forum thread:
http://www.prepar3d.com/forum/viewtopic.php?p=249585#p249585
Example:
[JobScheduler]
AffinityMask=65535
P3DCoreAffinityMask=65523