What Server Authority does
Roblox introduced a server-authoritative simulation approach with client prediction, rollback, and resimulation. The server remains the source of truth, while the client predicts the immediate result of player input so movement and combat can still feel responsive. When the prediction differs from the validated server state, the client returns to the last correct state and simulates forward again.
Why this matters
Traditional Roblox networking forces developers to balance responsiveness against trust. Giving the client too much control can open the door to speed changes, flinging, wall clipping, fabricated hits, or manipulated physics. Waiting for the server on every action can make a competitive game feel delayed. Prediction and rollback are designed to address both problems.
This is relevant beyond shooters. Racing games need trustworthy vehicle positions. Sports games need consistent ball ownership and collisions. Social physics games need protection from clients forcing disruptive states onto other players. Server Authority could reduce the amount of custom networking code required for these genres, though creators will still need to validate game-specific actions and rewards.
What to test before enabling it broadly
Measure correction frequency under real latency, test custom character controllers, verify projectiles and abilities, and watch how NPC ownership behaves. A technically secure system can still feel bad if corrections are visually distracting.
Discussion
Which system in your current game is hardest to keep responsive without trusting the client too much?
Read Roblox's Server Authority overview
#1
Original analysis with links to official Roblox sources.