Earn a 50% discount on the DP-600 certification exam by completing the Fabric 30 Days to Learn It challenge.
From my experience this is a normal amount of ram usage. I've got reports that go higher than that. Power BI uses a lot of memory in order to calculate all of the visuals.
I've found that i've had lots of problems with machines with only 4gb of ram. I've been advising my staff to upgrade to at least 8.