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Can the tree handle ~85000+ nodes? 

a.         I am using dynamic loading – which looks good – but I am getting an Internet Explorer pop-up that asks if I want to disable a script that is running slowly – if I try to load a node that has many sub-nodes.

b.         I am concerned if the user were to open all nodes.

c.         Can I dynamically unload nodes that are hidden under closed folders?

d.         Can I enforce that only a single folder at one time be open for a given tree level? Will this (along with smartXMLParsing help?)

Yes, it is supported in  SmartXMLParsing  mode:

            tree. enableSmartXMLParsing (...

But tree must be well structured (less than ~200 item per level of branch) (See in documentation samples/pro_perfomance.html)

a ) The message can't be removed, but you can enable distributedParsing, which will allow to parse XML part by part ( in such case message must no occur )

            tree.enableDistributedParsing(

b) The performance of tree related on number of rendered nodes, in case of 85000 items it definitely kills all performance.

c) Not possible

d) It can be created by attaching custom code to onOpen event.

To find more precise comments upon this issue, we can offer you read about web user interface library and free scheduler calendar.