I swap out the cards and view them on a computer. Generally, if there are a lot of pics to view, I set the display to "extra large icons," and scroll through looking at just one pic location on the screen. By scrolling I can pick up motion and know there is something to look at even if I can't see it that well. Then I might open the individual pic to view better. This only works because I have my cameras set to take a 9 pic series every time motion is detected. I only look at all the individual pics if there are a smaller number, less than 250 maybe, because the computer doesn't load them as fast as I want to view them. Another option is to set your cameras up for a lower resolution so the files are smaller and can load faster.
One thing that slows me down is that viewing the pics almost always brings on nap time, right there in the chair. I don't know a fix for that.