Samsung 990 PRO drop in speed with Bitlocker ON.

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I recently replaced my old Samsung NVME with a 990 PRO 2TB, I tested its speed with Magician and CrystalDiskMark and they both gave me a speed of 7450MB/s. I turned Bitlocker ON and the speed on Magician went down to 3487MB/s but remeined the same on CrystalDiskMark. Apparently Bitlocker has a big impact on speed.

My secondary Samsung 970 EVO 2TB is not affected by Bitlocker, the speed remains the same.

Are you having the same issue?

[flycaster]

Good morning. I’ve the same issue on my Asus TUF A16. Bitlocker heavily impact on RND4K performance when turned on. From 3500 to 250. 
Any solution? Thank you. 

[flycaster]

Bitlocker OFFBitlocker ON