Delayed detection of usb storage at startup (device connected sound)

I experience a delayed detection of usb storage at startup (device connected sound) with uefi + ultra fast boot

I didn't have that issue at all when my win 10 had been booting with MBR/BIOS + ultra fast boot. The process was slower somewhat, and, I guess, the enclosure had more time to initialize before the desktop screen. With GPT/UEFI, howerver, the boot process is much faster. It seems the storage can't keep up. Is there a way to fix that, apart from changing the storage or relocating disks to sata connection?

Win 10 1809 17763.195
Win 10's fast startup option is off.
The enclosure is Akitio NT2U3 USB 3.0 with 2 hdds. NT2 U3 | USB 3.0 Hard Drive Enclosure with RAID | AKiTiO
The mother board is GA-Z97X-UD5H GA-Z97X-UD5H (rev. 1.0) | Motherboard - GIGABYTE Global
Specs: https://i.imgur.com/jwGIe7E.pngUsb
Usb view: https://i.imgur.com/Yy1xrCq.jpgUsb
Usb connection RL: https://i.imgur.com/j8LJoYT.jpgPower
Power plan: https://i.imgur.com/0eQlz3B.jpg https://i.imgur.com/4FqqSJF.jpg
Bios: https://i.imgur.com/qF30QCv.jpg https://i.imgur.com/SD68ods.jpg
Stuff: https://i.imgur.com/Q1GiC6m.jpg

EXCI mode: enabled (others are smart auto, auto, disabled)
ECHI mode: enabled
XHCI hand-off: enabled
EHCI hand-off: enabled

If XHCI is smart auto + ultra fast boot, I get delayed periphery and DAC (the red sound icon) detection (mouse + kb) and ofc mass storage too. Also, sometimes: dcom "The server {9BA05972-F6A8-11CF-A442-00A0C90A8F39} did not register with DCOM within the required timeout."
If XHCI is smart auto + disabled fast boot, everything is fine at desktop startup, no delays with anything, no device connected sound.

IF XHCI is enabled + ultra fast boot - DCOM error, even MB's lan lagged for a sec with yellow icon, red sound icon, device connected sound, global usb device delay in other words.
If XHCI is enabled + disabled fast boot - everything is fine: no global usb devices delay (kb+m+dac), no device connected sound, no DCOM.

If external storage is disconnected - non of these permutations matter, it's always nice and responsive boot from the very first moments desktop appears.

Berton said:

A couple of basic thoughts, one is that the BIOS has to enumerate all connected drives during its check for bootable devices, can take awhile, and the other is that the BIOS comes with support for USB 2 but the OS has to load USB 3 drivers during its startup. The very latest motherboards may have that built-in support for USB 3. For basically the same reason I have to Disable the Boot from LAN option in the BIOS to keep it from searching my 2 NAS drives connected to the Router, probably just because they are on the Local Area Network.

There are only two (one) devices allowed to be searched for boot manager: ssd via bios and the same ssd via uefi, all other options are disabled. My motherboard comes with 8 or so usb 3.0 ports and a usb 3.0 controller in the south bridge, how could it not support usb 3?

Related bios settings: https://i.imgur.com/qN7NzD1.jpg https://i.imgur.com/EPAxC6j.jpg https://i.imgur.com/nbnNSXf.jpg https://i.imgur.com/zvC8Zyg.jpg