This is about the same argument as:
Trying to use my Dolphin pool float (the one with the tongue sticking out) in my new pool. The float keeps getting deflated. Is it even possible with 25,000 gallons? If this is the case, my I'm getting rid of my new pool!
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How many gigs does it take to stream? Less than 1GB. There is either something wrong with the DisneyPlus app, something wrong with the browser (Google Chrome is known to use a LOT of memory), or you're running other things in the background. Maybe something is indexing, using a lot of memory. It's possible that some of the 8gb memory is bad, but we'd need to know more information.