Thanks for your inquiry.
1. For a typical Aspose conversion from Word to PNG/JPG how many threads are started internally by Aspose.
Aspose.Words doesn’t use multi threading internally when converting a document. Everything is done on a single thread.
2. Are there any settings that could be used to control the number of threads Aspose would start for a given conversion?
There is no access to internal methods/properties of Aspose.Words. You can only use Public APIs of Aspose.Words.
Would it be possible to set the thread priority?
Yes, you can set the priority of the reported issues if you have Priority/Enterprise support subscription. I don’t see a “Priority Support” badge associated
with your account. In case you don’t have a Priority/Enterprise support subscription, please visit the following Enhanced Support options: