Slower

Stop inhaling your food. You should eat a little slower.

But light does not travel at the same speed through all materials; it goes slower through some than through others.

The wider the V angle, the slower the speed.

While light waves travel most quickly through air, they go slower through water and even slower through glass.

If you do it a bit slower, it goes quicker.

Could you talk a little slower?

Could you please speak a little slower?

Speak slower, please.

You're slower than a villain's horse.

Tom speaks slower than Bill.