best way to create projectiles/ large moving parts?

Currently, I’m working on a magic based PvP game, which involves a lot of size changing, moving parts. With FE being enabled, I can’t just create parts via local script like you used to do, so i have a setup like this;

— serverscript —
function magicevent(player)
    parts created, properties assigned, velocities added, etc
end

RemoteEvent.OnServerEvent:Connect(magicevent)

— localscript —
button.Pressed:Connect(function()
    RemoteEvent:FireServer()
end

Sorry for the very vague code, I’m on mobile and tried to give an outline of what I’ve done. I basically have all the creation of parts on the server and have the server handle it once the client calls for it.

This causes a lot of lag, and I was wondering how to do this and avoid the lag caused? I’ve seen multiple games handle a number of moving parts with barely any lag but i’m not sure how.

The only other way I can think of is having everything handled on the client, passing through the server, and replicate it to all other clients using FireAllClients().

If you are moving and object from one place to another you should use object tweening but since you specify it as a projectile then you should use network ownership.