A330-Neo underpowered

It seems the a330-Neo is really underpowered. At 30,000 It requires N1 86% with a 75% load. At 36,000 it requires N1 89-90% with a 50% load. Honestly there only seems to be a cosmetic change between the A330 and A330 Neo

High-bypass turbofan engines are actually more efficient at higher N1 %s - so what you are seeing is normal. Despite the Trent 7000s being newer, this does not necessarily mean that the first fan blade speed (N1%) will be lower.

For some context, here are some real figures from the A330-300 manual.

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You’ll be loosely expected to have 92.3% N1, cruising at M.80 at FL310 at 200,000 tonnes. I do not have access to a NEO specific manual at the moment, but if I was to guess the figures would also be similar despite having newer engines.

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I guess what’s also throwing me off is that at N1 92% it sounds exactly like the takeoff engine thrust of the 777. So cruising it sounds and feels like the engines are overworking. Are they the same engine sounds?

Yes the 777 family and the A330 have the same sounds

This is because of restriction if I remember

Yes, the A330 and the A330-Neo use the same engine sounds as the 777 family.