Multithreading in upgrade, EncodedMatMul constructor

[TabOg]

Hi, as observed in the matmul examples, the encoding of linear transformation matrices is quite time consuming, taking a similar amount of time as the actual linear transform. It doesn't seem to me like multithreading is used in the encode constructor or similarly in the upgrade constructor: is this correct? If so, is there a reason adding it would cause problems? TIA!