I cannot provide download links. However, if you insist on experimenting:
Because the portable version doesn't install to C:\ , it might default to the USB drive as a scratch disk – which is very slow . Adobe Photoshop Portable CS6 13.1 -x32 X64- Multi 64 Bit
While the full CS6 takes 30-60 seconds to cold start, a well-optimized portable version (stored on an SSD or fast USB 3.1 drive) can launch in under 10 seconds. It loads only necessary DLLs at runtime. I cannot provide download links