After creating some hi-poly model, i'm always creating low-poly model by approximating that hi-poly mesh with triangle-by-triangle LP mesh - with snap to face mode turned on. 

So the process looks like `CTRL` + `RMB` (x times), and hitting `F` on keyboard, so the new face was made.

Then I'm using this low poly model to texture baking, mainly for gamedev purposes.

This method is very time consuming, so how to make retopology process easier and quicker?