Number of values to be passed to a report-level filter - is there a limit?

Hello,
Does anyone know if there is a limit on the number of values a Page Level Filter can be passed? 
We would like to pass a large number of values from a map created in a web app to an embedded report via the page level filters - however, it seems that when we try to pass more than 500 unique values or so to a single report level filter ( the Asset Key), the reports are unable to load.   All embedded reports' visuals fail with the following error: "Couldn't retrieve the data for this visual. Please try again later."
Any thoughts on if there is a limit and if it can be overcome are appreciated - thanks!