It might be a good thing for you to try to figure out just why it’s not performing much better than the old one.
(Sorry if you already know this or don’t care):
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If you have ASIOguard OFF then look at how your cores are being loaded when using Cubase. You can open task manager and look there. It could be that your new CPU isn’t using roughly half of it’s logical cores. Of course, that should still be over 50% more than the old CPU.
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Keep an eye on CPU frequency. Is it boosting properly when needed? The base frequency of the new CPU is lower than the boost frequency of the old one (on paper), so hypothetically I would think that if there’s a problem with boosting then it could appear like it’s performing roughly the same.
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Also maybe try to push your project harder. Average project load is one thing but the real question is what happens when you try to ‘break’ things. After all, if you don’t see any differences but it’s working then who cares, right? It’s only when your workstation doesn’t do its job any longer that you have a problem.
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Lastly just remember that having processing in series, one after another, puts a higher load on the CPU core(s) than having it in parallel. So that too will affect how your CPU is pushed.