You can lower the file size to under 70KB without making the picture too small.  Most jpeg's are in a higher resolution than is needed for display on monitors.  Reduce the resolution a bit.

When I was writing my book and had to look at details of the various photos to be included in the book. I learned a trick from an IT friend. He basically said "to hold down the ctrl button and roll the mouse wheel down to enlarge the screen to what ever size you need". Thereby enlarging the images on the screen as well. Just remember to readjust it after you are finished. 

Might see if this helps you to see what you need.