How do I find a memory leak in my game?

Use a memory profiler: run the game and watch whether memory climbs steadily over time instead of staying flat (a rising line is the leak), then trigger suspected actions repeatedly (loading levels, spawning, opening menus) and see what grows and never comes back down, that's what's leaking. The profiler can often show what's holding references to the leaked objects.

What causes memory leaks in games?

Memory allocated but never freed: objects created but not destroyed, references held to data that should be released (so it can't be freed), caches or lists that only ever grow, and event handlers never unsubscribed (keeping their targets alive). It often happens on repeated operations, leaking a little each time you load a level, spawn an enemy, or open a menu, so it accumulates over a session.

How do I fix a memory leak once I've found it?

Ensure the accumulating memory is released: destroy objects when done (or pool and reuse frequently-created ones), drop references you no longer need so the memory can be freed, cap or evict growing caches, and unsubscribe event handlers when done. Then verify with a profiler that memory stays flat over a long session, the definitive confirmation the leak is gone, and confirm out-of-memory crashes disappear in the field.

How to Fix a Memory Leak in Your Game

Quick answer: A memory leak is memory the game allocates but never frees, so usage grows over time until it causes slowdowns or an out-of-memory crash. To fix it, use a memory profiler to find what accumulates over a session (it's usually objects not destroyed, references held that should be dropped, growing caches, or event handlers never unsubscribed), then ensure that memory is released or the objects are pooled and reused.

A memory leak is sneaky because the game runs fine at first and only degrades or crashes after extended play, the leaked memory accumulates until it becomes a problem. Fixing leaks is a matter of finding what's growing and never being released, which a memory profiler makes systematic, and then ensuring proper cleanup.

What a Memory Leak Is

A memory leak happens when memory is allocated but never freed, so it piles up. Each leaked allocation may be small, but over a session they accumulate, growing the game's memory use without bound until it slows down (memory pressure) or crashes (out of memory). The classic game pattern is leaking on repeated operations, a little memory leaks every time you load a level, spawn an enemy, or open a menu, so a player who does that a lot hits the problem faster.

Common specific causes: objects that are created but never destroyed, references held to data that should be released (so it can't be garbage-collected/freed), caches or lists that only ever grow, and event handlers/subscriptions never removed (keeping their targets alive). The unifying theme: something keeps memory alive that should have been let go.

How to Find the Leak

Use a memory profiler, it's the systematic way to find leaks. Run the game and watch whether memory (or object/resource counts) climbs steadily over time rather than staying flat; a rising line is the leak. Then trigger the suspected actions repeatedly (load a level, spawn things, open menus) and see what grows and never comes back down, that's the type being leaked, and the profiler can often show you what's holding references to it.

For leaks that only manifest in the field (in long player sessions you can't easily replicate), the signature is out-of-memory crashes correlated with long session length. Bugnet captures device context including memory information with each crash and groups them, so an out-of-memory crash cluster tied to long sessions confirms a leak is reaching players and tells you to go hunt it with the profiler. Field data tells you a leak exists and matters; the profiler tells you exactly what's leaking.

How to Fix It

Once the profiler identifies what's accumulating, ensure it's released. For objects not destroyed, destroy them when done (or, for frequently-created objects, pool and reuse them instead of allocating and discarding, which also reduces GC pressure). For references held too long, drop them when no longer needed so the memory can be freed. For growing caches/lists, cap them or evict old entries. For event handlers, unsubscribe when the subscriber is done so it doesn't keep its target alive.

After fixing, verify with the profiler that memory now stays flat over a long session instead of climbing, that's the definitive confirmation the leak is gone. Then confirm in the field that out-of-memory crashes tied to long sessions disappear on the new build via version-tagged reporting. The goal is a game whose memory use is stable no matter how long it runs, which both fixes the crashes and keeps performance steady over long sessions.

A memory leak is what you allocate and never free, growing until the game slows or crashes. Profile to see what climbs over a session, then release or pool it, verify memory stays flat.