Here is a great image to try, just copy all of the following into the Image URL box: https://upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Monarch_Butterfly_Showy_Male_3000px.jpg/320px-Monarch_Butterfly_Showy_Male_3000px.jpg
Smaller Images Will Process Faster. The Larger It Is, the Longer It Will Take!
The More Filters You Add, the Longer It Will Take
When Modifying Filter Settings, the Bigger the Numbers, the Longer it Will Take
Finally, this experiment was adapted from various posts by Dewald Esterhuizen. Check out his awesome blog Software By Default