We've made some progress on diagnosis, but no fix yet. Nvidia performance overlay is showing that the GPU clock is limited to 210Mhz. This should be much higher, particularly when under load (2000Mhz+). Bizarrely the overlay also says the GPU power is stuck at 588 Watts, which cannot be true otherwise the laptop would be on fire lol. A bit of googling shows that this is a common (ish) problem across a range of laptop manufacturers. Most common fix seems to be either a BIOS update or rollback, so that's the next thing to try I think. Sadly, while I can download the BIOS update, I've not worked out yet how to apply it 😕
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