How to Stream Spectator and Replay Data Efficiently

Naive spectating and replays are expensive. Read-only streams and input logs make them cheap. Here is how.

How to fix it

1. Stream a delayed feed

Serve spectators a delayed, read-only snapshot stream so they add little authoritative cost.

2. Record inputs or deltas

Store replays as input or delta logs that reproduce the match deterministically instead of full frames.

3. Replay deterministically

Reconstruct the match from the log so replays are tiny and exact.

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 backend 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.