Bad performance at login screen from cold boot

Every time I do a full reboot the login screen seems to function with huge amounts of lag. Seems intermittent to a degree (overall it's always "laggy", but some cases are worse than others) but in some instances it's pretty bad (taking several seconds to reflect the "dots" for my password).
Performance once I'm past sign in is completely fine, and the problem doesn't happen if I manually lock, it's only in the first login from a cold boot. Any insight?
I have HDR enabled, not sure if this makes a difference since I've noticed (based on brightness) that the first login appears to be in SDR.

Thanks!
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