Due to the slow linking of BC1 I changed my output directory (from BC-drive to local drive) and did some new tests:
Boxcryptor 1 (filename encryption enabled) : 0:15 min
Boxcryptor 2 (filename encryption disabled) : 1:25 min
I also wanted to test how Cryptomator performs.
But I had plenty of locked files (couldn't access them anymore within the drive) or couldn't even create folders when I copied my original data into the cryptomator drive.
The copy speed is also very slow. So I conclude (without being able to test) that it cannot be faster than BC2