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This post was edited by tahen at 14:13, Sep-21-2018
You can cover for it to major extent by disabling lock unlock sounds, but still it wont be as fast as last 9.x version.
In earlier versions, it worked well with even sounds on. You touch n it unlocked almost instantly.
Theres a significant dealy in unlock via fingerprint in miui10. Hope they fix it in updates.