Extremely Slow USB Bitlocker Encryption

We are implementing a policy to enforce USB drive bitlocker encryption and have found the process is exceptionally slow. (30 minutes+ for a 32GB blank flash drive.)

Are there any settings that could cause encryption to be this slow? We are using XTS-AES 128 encryption and all computers are Windows 11 24H2 and enrolled in Intune MDM.

Edit: We are also already using the option to only encrypt used space.