For Resync in Roblox , the practical way to control entities is to keep gameplay logic on the server and use the client only for visuals, movement prediction, or temporary effects. Roblox’s networking model also supports handing physical control to the appropriate client through network ownership when that makes sense for responsiveness.

How to structure it

A solid pattern is:

  1. The server decides when an entity exists, where it spawns, and what state it is in.
  2. The client renders or animates that entity for smoothness.
  3. If the client needs instant feedback, create a temporary local version first, then reconcile it with the server after validation.

That matches common Roblox replication advice: create or validate on the server, then let clients handle motion and presentation.

Controlling entities safely

If you mean “how do I make entities move or act,” use this split:

  • Server: AI, health, damage, spawning, despawning, ownership, authority.
  • Client: interpolation, effects, animation playback, UI, prediction.
  • Network ownership: assign it only for physics objects that should feel responsive to one player.

For example, if an NPC or dropped item needs smooth physics, the server can create it and then give ownership to the nearest relevant player when appropriate. If the entity is purely gameplay-critical, keep server ownership and replicate results outward.

With Resync specifically

Resync is a parallel Luau thread pool library, so it helps with running work in parallel, not with replacing Roblox replication rules. In other words, Resync can help you process entity logic faster, but you still need the normal client-server pattern for authority and syncing.

A common setup is:

  • Use Resync for heavy per-entity calculations.
  • Use the server to apply final outcomes.
  • Use remote communication or replicated instances for clients to see the result.
  • Use client-side prediction only for temporary responsiveness.

Example approach

If you have a creature, projectile, or dropped loot entity:

  1. Client requests spawn or action.
  2. Server validates the request.
  3. Server creates the real entity.
  4. Server optionally gives network ownership for physics responsiveness.
  5. Clients display movement, effects, and animation.
  6. Server corrects any bad state.

That approach avoids desync and matches the recommended Roblox pattern of server authority with client presentation.

What to avoid

  • Don’t let the client be the only source of truth for entity state.
  • Don’t use client control for damage, inventory changes, or despawning decisions.
  • Don’t rely on Resync as a replacement for replication; it is a parallel execution tool, not a networking layer.

Practical rule

If the entity can affect gameplay, the server should control it. If the entity only affects smoothness or visuals, the client can help present it. If it is a physics object, network ownership is the bridge between the two.

TL;DR: Use server authority for entity logic, client-side prediction for responsiveness, and network ownership for physics objects that need smooth movement. Resync can speed up logic processing, but it does not handle replication by itself.