Slow LOD load from server to client

Hi, I was able to get DH loaded on client side and server side. I used the pregen command to generate 150 chunk radius. It looked grate, but when I relog to get back into the server, it takes 5-10 minutes for my LOD distance to load all that again.
I thought once they were loaded, it would be pretty instant when logging back into a world. Is this assumption wrong?
I’m on a pretty old CPU for client side… sitting around 90% even though (I think) that the server already did all the generation. Is it just a bottleneck accessing the data?
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