I whipped up a simple fireworks module a day or two ago, and made it public for other people to play and test.
Here is a gif of some of the fireworks I’ve been able to make with absolutely little to no lag:
https://gyazo.com/f7a7db9c872c3403c779a8da6da12f7d
You can test the fireworks here:
https://www.roblox.com/games/7227394894/Plot-Festival-Fireworks
