Everything I need to know so my game doesn't lag?

[Wyzloc]

I want to know everything about making sure performance is clean in my game. I’d like to know everything that causes lag, or makes a server laggy forever.

[xZylter]

Ways to Prevent Lag & Optimize Your Game

I’ve been researching this topic for a long time now, safe enough to say I have some accurate information. Building Use Unions for similar objects (repetitive chairs, tables, trees, etc) Avoid using textures in areas where players will not be able to visually see it. Overall, avoid too many parts, I believe there was something called greedy mesh where if you had multiple parts that could be merged it will merge it. Set BasePart and Meshes CollisionFidelity to Hull. Anchor parts that don’t ne…

[colbert2677 (ImagineerColbert)]

Additionally:
https://devforum.roblox.com/t/what-are-expensive-things-to-do-in-a-roblox-game-that-could-impact-performance/312144/4?u=colbert2677

Searching helps. Please do so before posting.

[xKaihatsu]

Use as many events as possible, if you can use an event instead of a loop, use the event.

Event based code always beats constant checks in a loop.