Extremely slow loading and high CPU usage

Hey there, I am having a strange performance issue with DH: Although the CPU usage is high at 100%, DH is loading chunks at a rate of ~<1 per second, slower than real chunk generation. DH is also set to distantGeneratorMode = "PRE_EXISTING_ONLY", as I do not want it to generate unexplored chunks, which makes the slowness even more questionable.
I am testing in a single-player world, with the only generated chunks being the default spawn area.
Please let me know of any further steps to diagnose the issue.

Mod list is included in the logs: https://mclo.gs/X4WxDp2
mclo.gs
1059 lines | 6 errors
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