The ARM chips in the all of the Raspberry pis do not have AES accelerators. Encrypting your pis drive is going to be a serious hit on performance like you said. I don't recommend it.
If you really really really want to encrypt your Rpi then you need to use a disk cipher like Adiantum. It is based off of ChaCha12 and was made specifically for low end CPUs that lack AES accelerators.
The ARM chips in the all of the Raspberry pis do not have AES accelerators. Encrypting your pis drive is going to be a serious hit on performance like you said. I don't recommend it.
If you really really really want to encrypt your Rpi then you need to use a disk cipher like Adiantum. It is based off of ChaCha12 and was made specifically for low end CPUs that lack AES accelerators.