What can ease this issue is writing: “R.Streaming.PoolSize 0” in the console commands.
What causes this according to some folk is that, like UE4, UE5 is constantly caching everything you open up in your project, to facilitate loading times while CREATING your project.
Thankfully this issue only affects us devs! When you package your project and release it as a final product, it doesnt happen! Or at least it should.
We will have to endure with this issue 
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