I found why hybrid encodes quicker than other GUI

[Selur]

The other GUIs configure preset slower when user select slower.I think the Hybrid preset and tune apply button is redundant.There is not such apply button when new users select video and audio in hybrid,so new users will miss the preset and tune apply button step consequently.

I do not agree with that.
If this is a problem for you: do not use Hybrid.

But Hybrid can't configure ref=8 when there is already a input video.It force to configure ref=4.How to configure ref=8?

That is because Hybrid abids by the standard Profile&Level restrictions. If you don't want Hybrid to do that, simply set Profile&Level to unrestricted.
"High" profile, with level "4.1", 23.976fps and does not allow so many reference frames.
see: https://forum.doom9.org/showthread.php?t=142758

Hybrid's defaults encodes crf with vbv_maxrate=62500 / vbv_bufsize=78125,so it will cause bigger video files than ffmpeg and other GUIs,because they don't force to configure vbv_maxrate and vbv_bufsize at the rate.How to encode crf without vbv_maxrate and vbv_bufsize? Just let the hybrid deside the rate automatically.

I doubt that the vbv settings create larger files, they should only cause smaller potentiall less quality files.
That is because Hybrid abids by the standard Profile&Level restrictions. If you don't want Hybrid to do that, simply set Profile&Level to unrestricted.

Why the BD X2 media limit is vbv-maxrate 40000 and vbv-bufsize 30000?Shouldn't it be vbv-maxrate ≤vbv-bufsize?

Are you sure you understand how VBV works and what the media limit does ?
Reading https://forum.doom9.org/showthread.php?t=154533 might help. (images might not show depending on your browser since they use http links)

I'm confident that Hybrid properly restricts and sets max ref count etc. according to the input and the settings which tell it to be standard compliant.

Cu Selur