Performance Issues Working with Anvil Data Tables and Row Iterators

I always get terrible performance when I do this, even on the server side:

filtered_results = [x for x in product_data]

I had assumed it was still making many (separate) calls to the data service and that explained the poor performance. Is that correct? Or is this expected to be performant on the Server?

Thanks!

Edit: Removed filtering from list comprehension example.

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