SkideAutoLag (Mop Classic)

The best wow players recommend having your spell queue window or lag tolerance setting at 100 + your home ping. However your lag fluctuates making it difficult to keep an accurate lag tolerance setting. 

This add-on always checks if your ping changes and adjusts AUTOMATICALLY your spell queue window to match your preference. It defaults to 100 + your current ping but you can adjust how much more than your ping you want to have as lag tolerance thanks to a reliable easy-to-use slider.