I'm wondering what is current state of the art of Substrate's pallet-contracts performance as compared to the same functional implementation as a pallet.

I acknowledge that different logic can have different cost, but it would still be useful to know if it is 2x inherently slower, 10x, 100x... It would help others to make a decision whether this is definitely not acceptable overhead or something that can be considered.

Specifically I'm curious about the cost without gas metering enabled, to get a sense of the baseline. Roughly the cost of running wasmi on top of wasmtime rather than natively, but I wasn't able to find benchmarks of those either.