Not sure if you are seeing this elsewhere but our clients are typically opening hundreds of streams and a couple were having terrible performance during the New York open and close.

One of the items we discovered when working with these clients was that their Documents folder was being synched to One Drive. The issue is that the IQConnect log file (which can be over 7 GB for a whole day session) is in {Documents}\DTN\IQFeed

Once we changed the registry setting for the users, there was a marked improvement in performance.

I would suggest that you find a better place for this file given that all new installs of Windows make it so that you have to Opt-out of documents being backed up to One Drive. AppData or ProgramData would be a better place.

This behavior hasn't changed recently that I know of. I'll speak to the development team about it and post findings here.

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Sincerely,
Gary Stephen
DTN IQFeed Implementation Support Specialist