Why does my game use more memory the longer it runs?

That steady growth is the signature of a memory leak: something is allocated and never freed, so memory accumulates over the session until the game slows down or crashes. Because it only manifests in longer sessions, quick tests miss it. The growth is gradual and continuous (unlike a one-time spike), so if memory climbs the longer you play, you almost certainly have a leak, and tracing what keeps accumulating points at the cause.

How do I find a memory leak in my game?

Recognize the growth-over-time signature (memory climbing steadily over a session), then trace what keeps accumulating, the usual suspects are objects never removed from collections, event handlers never unsubscribed, unbounded caches, and assets never unloaded. Capturing memory behavior over real, longer sessions reveals the climb (which quick tests miss), and field data showing which sessions and situations correlate with memory pressure narrows down where the leak is, so you can find and fix the specific pattern.

What Causes Memory Leaks in Games?

Q: What causes memory leaks in games?

Memory leaks come from memory that's allocated and never freed. Common patterns: objects added to a collection and never removed, event subscriptions or callbacks never cancelled (keeping objects alive forever), caches that only grow, assets loaded but never unloaded (especially reloading on each area entry), and references that outlive their use. Each leaves memory nothing will ever free, so it accumulates over the session, the signature of a leak.

Quick answer: Memory leaks come from memory allocated and never freed: objects kept in collections, event handlers never unsubscribed, unbounded caches, and assets never unloaded. Memory climbs over a session until the game slows or crashes.

A memory leak makes your game use more and more memory the longer it runs, eventually slowing down or crashing. Leaks are sneaky because they only show up in longer sessions. Here's what causes memory leaks in games and how to recognize them.

The Common Leak Patterns

A memory leak is memory that's allocated and never released, so it accumulates. The patterns that cause leaks are specific and recognizable.

Objects added to a collection and never removed, a list or dictionary that only grows
Event subscriptions or callbacks never cancelled, listeners that keep objects alive forever
Caches that only grow, cached data never evicted or bounded
Assets loaded but never unloaded, especially loading the same asset each time an area is entered without freeing it
References that outlive their use, holding a pointer to something that should have been freed
Circular references, in some environments, objects referencing each other so neither is collected

Each pattern leaves memory allocated that nothing will ever free, so it piles up over the session, the signature of a leak.

Why Leaks Only Show Up Over Time

A leak's defining trait is gradual growth: memory climbs steadily the longer the game runs. This means leaks don't appear in quick tests, you have to play for a while before the accumulation becomes visible, which is why they often escape testing and only crash players in long sessions.

Bugnet captures memory-related crashes and performance over real sessions, so the long-session out-of-memory crashes a leak causes surface in your data even though a quick test would miss them. Recognizing steady growth over a session is how you identify a leak versus a one-time spike.

Finding What's Leaking

Finding a leak means tracing what keeps accumulating. The patterns above are the suspects, so you look for collections that grow without bound, handlers never removed, or assets never unloaded. Field data showing which longer sessions correlate with memory pressure narrows where the accumulation is.

Bugnet helps you see which situations and longer sessions correlate with memory pressure and crashes, pointing you toward the leak. So memory leaks are caused by specific 'allocate and never free' patterns, and finding the cause means recognizing the growth-over-time signature and tracing what accumulates.

Memory leaks come from 'allocate and never free' patterns: objects never removed, handlers never unsubscribed, unbounded caches, assets never unloaded. Memory climbs over a session, only visible in longer play.