Your Geekbench score indicates your CPU is likely below what is recommended for BIAB. While no minimum score has been explicitly stated, a discussion about two years ago recommended a score around 1500 minimum for you to be pleased with the performance. A lot of people seem to underestimate how powerful a program this is and how much it uses computer resources. BIAB will work for you, but slowly.

An SSD drive running over USB (even 3.0) is severely crippled, limited to the USB transfer rate that is generally lower than an internal SATA traditional hard drive.

Granted, this is extreme, but my BIAB program is on an internal SSD drive and my RealTracks and RealDrums are on an internal 10,000 rpm hard drive.
However, because my CPU is also fast, BIAB runs satisfactorily from the supplied PG Music USB drive. The CPU speed is easily more important to BIAB than the storage device speed.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.