Contact the dealer and tell them that performance has decreased dramatically after the update.
New ECU updates can and sometime do cause unforeseen problems that take the manufacturer a while to realise. I had a similar situation with my Volvo V60 D3 after its first service -- it came back to me with significant turbo 'lag' and generally flat performance compared with how it was before the service.
I called the dealer and described the symptoms. Guess what? There was a dealer service bulletin covering the problem and how to remedy it.
Talking to the dealer service manager, the problem was that the new ECU update downloaded from the main Volvo service computer was wiping / resetting parameters including turbo boost curves, turbo actuator mapping etc. They took the car back, sorted it and it was as good as new.
Just because it's a 'main dealer software update' doesn't mean it's been fully tested, or even works properly. Think about all the Microsoft, Adobe, Flash and other software updates for PCs that don't work, crash and cause problems .... it's exactly the same with cars.
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