Investigate Multithreading Feasibility for Step 1 algorithms

An investigation into the use of multithreading for improving performance in step 1 algorithms is needed. Technically, the step 1 algorithms are independent from each other, and it could be possible to parallelize the calculations of them in python. However, it's possible that QGIS already utilizes all the available resources and CPU power well, in which case this optimization would not be necessary.