The Fastest Way to Slice Cherry Tomatoes is to buy a cherry tomato cutter that you can buy on Amazon for around $10.00
I have a cherry tomato cutter and it works great and slices and cuts the cherry tomatoes really fast, safe and easy.
I used to just use a knife to slice them but sometimes they would slide around me.
To cut the cherry tomatoes fast with a knife you can do so by following the below directions.
Use a knife and a really sharp chef knife or, my preference, a serrated knife to slice parallel to the counter, thereby halving all of the cherry tomatoes at once.
However you should get a cherry tomato cutter if you cut a lot of cherry tomatoes as it will make it go much faster and it's easier.