**Go to the addon file location:**

[![enter image description here][1]][1]

[![enter image description here][2]][2]


**Copy the py file to desktop or other place.  
Open with Notepad or other editor**


[![enter image description here][3]][3]

**Find the text: def boolean_mod**

[![enter image description here][4]][4]

**Add text between line 580 and 581**

    md.solver = 'FAST'

[![enter image description here][5]][5]

**Save and replace the original**

[![enter image description here][6]][6]

**It will use the fast algorithm when apply the modifiers in this operator.  
But may be it cannot improve the performance because blender use exact solver on default when create a boolean modifier.**

  [1]: https://i.sstatic.net/7Ay1v.png
  [2]: https://i.sstatic.net/wSRAi.png
  [3]: https://i.sstatic.net/ZZ9Xs.png
  [4]: https://i.sstatic.net/tXhfv.png
  [5]: https://i.sstatic.net/g16Gr.png
  [6]: https://i.sstatic.net/RvpK9.png