Hi @db042190 ,
Did you get any error or warng from the website or SSRS log ? Did you notice the delay from SSDT preview or SSRS web portal?
How long does the delay exist? Did you notice the delay for same duration from differant machine, it could be caused by the browser engine and UI performance .
Frankly it is hard for us to diagnose or optimise the report that has this kind of delay issue with forum support. We could not audit the server here, when there is no clear error or warning messege, it is hard to locate the real issue.
If this issue really bothers you, I would suggest you to open ticket with Microsoft Support : https://support.microsoft.com/en-us/assistedsupportproducts They could support better with testing and auditing on the real server for troubleshoot this.
Regards,
Joy
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