Maybe it's my processor or graphics card hindering both programs. Hmm....I know when I use the knife I'm not exact on the edge I start a little over the top one and end a little below the bottom one, but it's quicker and more efficient that way instead of trying to start perfectly on the edge itself, unless that's necessary. 

Also, blender puts away the tool after creating one edge, so I have to keep hitting 'K' to pull up the drop down and reselecting it for each edge I make.