Functions in the symbolic toolbox do not use the high performance libraries, as those libraries are for hardware floating point numbers only; the symbolic toolbox uses symbolic variable names and software rational numbers and software floating point numbers.
It is more difficult to write multi-threaded symbolic mathematics than it is to write multi-threaded hardware floating point mathematics. Even Maple and Mathematica are fairly restricted in what they automatically use multiple threads for.
"Is there full information about functions and toolboxes anywhere except mathworks.com?"
No.
