How to Fix a Memory Leak in a Game

A memory leak is memory that should have been freed but is still referenced. Watching what grows and snapshotting the heap finds it. Here is the method.

How to fix it

1. Confirm it is a leak

Repeat an action (load and unload a level, open and close a menu) many times and watch memory. If it rises each cycle and never returns to baseline, you have a leak — a steady climb, not a one-time cost.

2. Snapshot the heap

Take heap snapshots before and after the repeated action and compare what grew. The object types accumulating point at the leak — often event handlers, cached assets, or entries in a never-cleared collection.

3. Release the references

Find where the growing objects are referenced and free them on the correct lifecycle event: unsubscribe events, clear caches, return pooled objects, and avoid static collections that only grow. Re-test to confirm memory returns to baseline.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every your game error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.