Been running into the Texture Streaming Pool Over Budget error in UE5 this morning and found this blog post that fixed it in a jiffy. Check it out on stefanperales.com
For example, if you're still getting the texture streaming pool error, then you may need to increase the pool size.
To do this, open your /Config/DefaultEngine.ini file and look for a [/Script/Engine.RendererSettings] section. If it doesn't exist, create it. Then add the following:
r.TextureStreaming=True
r.Streaming.PoolSize=1000
Restart your editor after updating. The the value you pass to r.Streaming.PoolSize=1000 will vary depending on the needs of your project—it may even change during the lifetime of your project. The error will have given you an idea how much over the existing budget you are. For example, if you set it to 1000MB and the error says you're still 300MB over, you need to bump it up past 1300MB.
The file to edit is in your project folder FYI, not in the default application folder.