How to Fix Garbage Collection Stutter in a Game

A game that is smooth then hitches on a regular beat is almost always garbage collection. Something allocates every frame and the collector periodically stops the world. Here is how to fix it generally.

How to fix it

1. Confirm GC is the cause

Profile and look for collection pauses that line up with the hitches. If the spikes coincide with GC, allocations are the target; if not, look elsewhere first.

2. Reuse instead of allocate

Cache arrays, lists, and string builders; reuse vectors and buffers; avoid creating temporary objects in update loops. Each per-frame allocation feeds the collector.

3. Pool objects

For things you spawn and destroy constantly (bullets, particles, enemies), use an object pool so you reuse instances instead of allocating and freeing, which removes both the allocation and the eventual collection cost.

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.