Quick answer: Profile animation to find the cost — too many animators, complex rigs, off-screen updates — and cut it with LODs, culling, and simpler rigs.
Animation can quietly dominate the frame with many characters on screen. Profiling shows where. Here is how to cut it.
How to fix it
1. Profile the animation step
Measure animation cost and what drives it.
2. Cull off-screen
Stop animating characters that are not visible.
3. Use animation LODs
Update distant characters less frequently or with simpler rigs.
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 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.
A crash you can name from its stack trace is a crash you can usually fix in minutes.