Boot Windows ARM on Raspbery PI4 from SSD via USB3 adapter

I want to test my dev on ARM devices. With an SDCard it’s too slow, Windows is unusable.

I do :

• I build an Windows 10 ARM ISO
• enable USB with “winpatch”
• put on SSD (via USB3-SATA adapter)
• use an USB ethernet adapter for internet and transfers
• I use a USB-C PowerDelivery 65W

The issue info:

• BOOT_STOPPED : failed to open device: sdcard
• Bootloader 2020/04/16

It works with SDCard but too slow. What can i do ?