Encrypting the internal storage on a Fire HD8

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Fire HD 8, 8th gen, FireOS 7 - under the OS settings is an option to encrypt the internal storage. I usually do encrypt the internal storage on my Android devices, but I wanted to ask a couple of questions.

1) Does it cause any problems for USB transfers to/from a PC?

2) Is there a noticeable slowing of the device?

Thanks!