[Google Pixel XL Questions & Answers] craig.s:
I just realized my Pixel XL - verizon, unlocked bootlader, TRWP, Pie - is connecting to Windows only at USB 2.0 (high speed) rather than 3.0 (super speed).

I am using type A blue 3.0 socket with correct drivers on Windows side (external HDD etc have no problems), and I am trying both the stock Google cable (which has a white type A plug to be fair?!) and also a Benson-approved "Veckle" USB type-A 3.0 (blue) to USB-C cable.

I tried putting the phone USB mode in both file-transfer and "no data" (for debugging) but no difference.

I'm verifying this using USB Device Tree Viewer, I will dump the report below, but it's clear from file transfer speeds that it's way too slow @ 30 MB/s write & read.

Intel(R) USB 3.0 eXtensible Host Controller - 1.0 (Microsoft)
\---USB Root Hub (USB 3.0)
|HS-[1-1]
|HS-[1-2]
|HS-[1-3]
|HS-[1-4]: USB Composite Device

=========================== USB Port4 ===========================

Connection Status : 0x01 (Device is connected)
Port Chain : 1-4
Properties : 0x01
IsUserConnectable : yes
PortIsDebugCapable : no
PortHasMultiCompanions : no
PortConnectorIsTypeC : no
ConnectionIndex : 4
CompanionIndex : 0
CompanionHubSymLnk : USB#ROOT_HUB30#4&2060378&0&0#{f18a0e88-c30c-11d0-8815-00a0c906bed8}
CompanionPortNumber : 20

======================== USB Device ========================

+++++++++++++++++ Device Information ++++++++++++++++++
Device Description : USB Composite Device
Device Path : \\?\usb#vid_18d1&pid_4ee2#ht68t0203009#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
Device ID : USB\VID_18D1&PID_4EE2\HT68T0203009
Hardware IDs : USB\VID_18D1&PID_4EE2&REV_0318 USB\VID_18D1&PID_4EE2
Driver KeyName : {36fc9e60-c465-11cf-8056-444553540000}\0013 (GUID_DEVCLASS_USB)
Driver : \SystemRoot\System32\drivers\usbccgp.sys (Version: 10.0.17134.1 Date: 2018-04-12)
Driver Inf : C:\WINDOWS\inf\usb.inf
Legacy BusType : PNPBus
Class : USB
Class GUID : {36fc9e60-c465-11cf-8056-444553540000} (GUID_DEVCLASS_USB)
Interface GUID : {a5dcbf10-6530-11d2-901f-00c04fb951ed} (GUID_DEVINTERFACE_USB_DEVICE)
Service : usbccgp
Enumerator : USB
Location Info : Port_#0004.Hub_#0001
Location IDs : PCIROOT(0)#PCI(1400)#USBROOT(0)#USB(4), ACPI(_SB_)#ACPI(PCI0)#ACPI(XHC_)#ACPI(RHUB)#ACPI(HS04)
Container ID : {dc988900-f60c-5af4-b6da-af1e52beda4a}
Manufacturer Info : (Standard USB Host Controller)
Capabilities : 0x94 (Removable, UniqueID, SurpriseRemovalOK)
Status : 0x0180600A (DN_DRIVER_LOADED, DN_STARTED, DN_DISABLEABLE, DN_REMOVABLE, DN_NT_ENUMERATOR, DN_NT_DRIVER)
Problem Code : 0
Address : 4
Power State : D0 (supported: D0, D3, wake from D0)
Child Device 1 : Pixel XL
DevicePath : -
Device ID : USB\VID_18D1&PID_4EE2&MI_00\8&2912D0A1&0&0000
Class : WPD
Child Device 2 : Android Composite ADB Interface
DevicePath : -
Device ID : USB\VID_18D1&PID_4EE2&MI_01\8&2912D0A1&0&0001
Class : AndroidUsbDeviceClass

---------------- Connection Information ---------------
Connection Index : 0x04 (4)
Connection Status : 0x01 (DeviceConnected)
Current Config Value : 0x01
Device Address : 0x0E (14)
Is Hub : 0x00 (no)
Number Of Open Pipes : 0x05 (5)
Device Bus Speed : 0x02 (High-Speed)
Pipe0ScheduleOffset : 0x00 (0)
Pipe1ScheduleOffset : 0x00 (0)
Pipe2ScheduleOffset : 0x00 (0)
Pipe3ScheduleOffset : 0x00 (0)
Pipe4ScheduleOffset : 0x00 (0)

--------------- Connection Information V2 -------------
Connection Index : 0x04 (4)
Length : 0x10 (16 bytes)
SupportedUsbProtocols : 0x03
Usb110 : 1 (yes)
Usb200 : 1 (yes)
Usb300 : 0 (no)
ReservedMBZ : 0x00
Flags : 0x00
DevIsOpAtSsOrHigher : 0 (Is not operating at SuperSpeed or higher)
DevIsSsCapOrHigher : 0 (Is not SuperSpeed capable or higher)
DevIsOpAtSsPlusOrHigher : 0 (Is not operating at SuperSpeedPlus or higher)
DevIsSsPlusCapOrHigher : 0 (Is not SuperSpeedPlus capable or higher)
ReservedMBZ : 0x00

---------------------- Device Descriptor ----------------------
bLength : 0x12 (18 bytes)
bDescriptorType : 0x01 (Device Descriptor)
bcdUSB : 0x200 (USB Version 2.00)
bDeviceClass : 0x00 (defined by the interface descriptors)
bDeviceSubClass : 0x00
bDeviceProtocol : 0x00
bMaxPacketSize0 : 0x40 (64 bytes)
idVendor : 0x18D1 (Google Inc.)
idProduct : 0x4EE2
bcdDevice : 0x0318
iManufacturer : 0x01 (String Descriptor 1)
Language 0x0409 : "Google"
iProduct : 0x02 (String Descriptor 2)
Language 0x0409 : "Pixel XL"
iSerialNumber : 0x03 (String Descriptor 3)
Language 0x0409 : "HT68T0203009"
bNumConfigurations : 0x01 (1 Configuration)

------------------ Configuration Descriptor -------------------
bLength : 0x09 (9 bytes)
bDescriptorType : 0x02 (Configuration Descriptor)
wTotalLength : 0x003E (62 bytes)
bNumInterfaces : 0x02 (2 Interfaces)
bConfigurationValue : 0x01 (Configuration 1)
iConfiguration : 0x00 (No String Descriptor)
bmAttributes : 0x80
D7: Reserved, set 1 : 0x01
D6: Self Powered : 0x00 (no)
D5: Remote Wakeup : 0x00 (no)
D4..0: Reserved, set 0 : 0x00
MaxPower : 0xFA (500 mA)

---------------- Interface Descriptor -----------------
bLength : 0x09 (9 bytes)
bDescriptorType : 0x04 (Interface Descriptor)
bInterfaceNumber : 0x00
bAlternateSetting : 0x00
bNumEndpoints : 0x03 (3 Endpoints)
bInterfaceClass : 0x06 (Image)
bInterfaceSubClass : 0x01 (Still Imaging device)
bInterfaceProtocol : 0x01
iInterface : 0x07 (String Descriptor 7)
Language 0x0409 : "MTP"

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x81 (Direction=IN EndpointID=1)
bmAttributes : 0x02 (TransferType=Bulk)
wMaxPacketSize : 0x0200 (max 512 bytes)
bInterval : 0x00 (never NAKs)

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x01 (Direction=OUT EndpointID=1)
bmAttributes : 0x02 (TransferType=Bulk)
wMaxPacketSize : 0x0200 (max 512 bytes)
bInterval : 0x00 (never NAKs)

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x82 (Direction=IN EndpointID=2)
bmAttributes : 0x03 (TransferType=Interrupt)
wMaxPacketSize : 0x001C
Bits 15..13 : 0x00 (reserved, must be zero)
Bits 12..11 : 0x00 (0 additional transactions per microframe -> allows 1..1024 bytes per packet)
Bits 10..0 : 0x1C (28 bytes per packet)
bInterval : 0x06 (6 ms)

---------------- Interface Descriptor -----------------
bLength : 0x09 (9 bytes)
bDescriptorType : 0x04 (Interface Descriptor)
bInterfaceNumber : 0x01
bAlternateSetting : 0x00
bNumEndpoints : 0x02 (2 Endpoints)
bInterfaceClass : 0xFF (Vendor Specific)
bInterfaceSubClass : 0x42
bInterfaceProtocol : 0x01
iInterface : 0x06 (String Descriptor 6)
Language 0x0409 : "ADB Interface"

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x02 (Direction=OUT EndpointID=2)
bmAttributes : 0x02 (TransferType=Bulk)
wMaxPacketSize : 0x0200 (max 512 bytes)
bInterval : 0x00 (never NAKs)

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x83 (Direction=IN EndpointID=3)
bmAttributes : 0x02 (TransferType=Bulk)
wMaxPacketSize : 0x0200 (max 512 bytes)
bInterval : 0x00 (never NAKs)

----------------- Device Qualifier Descriptor -----------------
bLength : 0x0A (10 bytes)
bDescriptorType : 0x06 (Device_qualifier Descriptor)
bcdUSB : 0x200 (USB Version 2.00)
bDeviceClass : 0x00 (defined by the interface descriptors)
bDeviceSubClass : 0x00
bDeviceProtocol : 0x00
bMaxPacketSize0 : 0x40 (64 Bytes)
bNumConfigurations : 0x01 (1 other-speed configuration)
bReserved : 0x00

------------ Other Speed Configuration Descriptor -------------
bLength : 0x09 (9 bytes)
bDescriptorType : 0x07 (Other_speed_configuration Descriptor)
wTotalLength : 0x003E (62 bytes)
bNumInterfaces : 0x02 (2 Interfaces)
bConfigurationValue : 0x01 (Configuration 1)
iConfiguration : 0x00 (No String Descriptor)
bmAttributes : 0x80
D7: Reserved, set 1 : 0x01
D6: Self Powered : 0x00 (no)
D5: Remote Wakeup : 0x00 (no)
D4..0: Reserved, set 0 : 0x00
MaxPower : 0xFA (500 mA)

---------------- Interface Descriptor -----------------
bLength : 0x09 (9 bytes)
bDescriptorType : 0x04 (Interface Descriptor)
bInterfaceNumber : 0x00
bAlternateSetting : 0x00
bNumEndpoints : 0x03 (3 Endpoints)
bInterfaceClass : 0x06 (Image)
bInterfaceSubClass : 0x01 (Still Imaging device)
bInterfaceProtocol : 0x01
iInterface : 0x07 (String Descriptor 7)
Language 0x0409 : "MTP"

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x81 (Direction=IN EndpointID=1)
bmAttributes : 0x02 (TransferType=Bulk)
wMaxPacketSize : 0x0040 (max 64 bytes)
bInterval : 0x00 (never NAKs)

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x01 (Direction=OUT EndpointID=1)
bmAttributes : 0x02 (TransferType=Bulk)
wMaxPacketSize : 0x0040 (max 64 bytes)
bInterval : 0x00 (never NAKs)

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x82 (Direction=IN EndpointID=2)
bmAttributes : 0x03 (TransferType=Interrupt)
wMaxPacketSize : 0x001C
Bits 15..13 : 0x00 (reserved, must be zero)
Bits 12..11 : 0x00 (0 additional transactions per microframe -> allows 1..1024 bytes per packet)
Bits 10..0 : 0x1C (28 bytes per packet)
bInterval : 0x06 (6 ms)

---------------- Interface Descriptor -----------------
bLength : 0x09 (9 bytes)
bDescriptorType : 0x04 (Interface Descriptor)
bInterfaceNumber : 0x01
bAlternateSetting : 0x00
bNumEndpoints : 0x02 (2 Endpoints)
bInterfaceClass : 0xFF (Vendor Specific)
bInterfaceSubClass : 0x42
bInterfaceProtocol : 0x01
iInterface : 0x06 (String Descriptor 6)
Language 0x0409 : "ADB Interface"

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x02 (Direction=OUT EndpointID=2)
bmAttributes : 0x02 (TransferType=Bulk)
wMaxPacketSize : 0x0040 (max 64 bytes)
bInterval : 0x00 (never NAKs)

----------------- Endpoint Descriptor -----------------
bLength : 0x07 (7 bytes)
bDescriptorType : 0x05 (Endpoint Descriptor)
bEndpointAddress : 0x83 (Direction=IN EndpointID=3)
bmAttributes : 0x02 (TransferType=Bulk)
wMaxPacketSize : 0x0040 (max 64 bytes)
bInterval : 0x00 (never NAKs)

-------------------- String Descriptors -------------------
------ String Descriptor 0 ------
bLength : 0x04 (4 bytes)
bDescriptorType : 0x03 (String Descriptor)
Language ID[0] : 0x0409 (English - United States)
------ String Descriptor 1 ------
bLength : 0x0E (14 bytes)
bDescriptorType : 0x03 (String Descriptor)
Language 0x0409 : "Google"
------ String Descriptor 2 ------
bLength : 0x12 (18 bytes)
bDescriptorType : 0x03 (String Descriptor)
Language 0x0409 : "Pixel XL"
------ String Descriptor 3 ------
bLength : 0x1A (26 bytes)
bDescriptorType : 0x03 (String Descriptor)
Language 0x0409 : "HT68T0203009"
------ String Descriptor 6 ------
bLength : 0x1C (28 bytes)
bDescriptorType : 0x03 (String Descriptor)
Language 0x0409 : "ADB Interface"
------ String Descriptor 7 ------
bLength : 0x08 (8 bytes)
bDescriptorType : 0x03 (String Descriptor)
Language 0x0409 : "MTP"

This sucks as one reason I chose the Pixel was it's USB 3.0 support, as opposed to certain other dismal implementations of USB-C with only 2.0 transfer! and I want to be able to get video off the phone at maximal speed.

Any input?