Recently I have discovered a memory leak in my game, and I have narrowed it down to a single script. This script constantly spawns cars on a road, tween the cars to the other side, and then destroy them. I have experienced memory of over 5000 MB. Any ideas on how I can improve the performance of this?
Any help would be appreciated. 
You could try using Debris instead of destroying them
local Debris = game:GetService("Debris")
Debris:AddItem(Instance, Time) --Time = how long it takes for the object to be deleted, set to 0 to delete instantly
How is this different from destroying them?
Sometimes :Destroy() is wonky and doesn’t work properly
Can you share the code where you suspect the memory leak is? We can’t give you any answers without code.
Insert references to those cars inside a table, then periodically traverse over the cars within the table calling the Destroy() function for each. This way if for whatever reason a car isn’t successfully destroyed from a first attempt to destroy it, repeat attempts will increase the chances.
Are you destroying the Tweens that you create for moving them across the road as well as the cars? I’m assuming you’re connecting a Tween.Completed event to a function that destroyed the cars and depending on how your code is laid out the tweens may never be GC’d as a result.
I can’t believe this never crossed my mind. Thank you this fixed the problem.