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Slow creation of static routes

Hello, I want to create hundreds of static routes in a VPC to the internet gateway.
My problem is that each route takes around 7 seconds to be created.

routes.insert takes less than a second,
- most of the time is spent in operation.wait

I have tried batched requests. It saves I/O but it does some save much time.

AWS and Azure are order of magnitude faster than GCP for this use case.

What would you suggest to be able to create a big route table in a timely manner?
Thank you,

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