What causes fast-forward catch-up freezing the game?

On return the game tries to run every missed tick in one frame, so a long absence produces thousands of queued ticks that block the main thread until they all finish.

How do I catch this when it only happens for some players?

Capture it automatically from the player's device with the full stack trace, the device and OS, the build, and a breadcrumb trail of what they did. That turns a vague complaint into a specific, reproducible issue you can fix without owning the hardware it happens on.

How to Fix Fast-Forward Catch-Up Freezing the Game After Returning

Quick answer: Cap how many catch-up ticks run per frame to spread the work, and for very long gaps run a coarse offline simulation instead of replaying every fine tick.

When coming back after a long away period locks the game for seconds, it is replaying the entire backlog of ticks in a single frame. Bound the catch-up rate and use an offline approximation for big gaps. Here is how to catch up smoothly.

How to fix it

1. Cap catch-up ticks per frame

Process at most N accumulated ticks per frame and let the rest carry over, so a large backlog is consumed over several frames instead of freezing on one.

2. Use coarse offline sim for long gaps

For gaps beyond a threshold, advance the economy and needs with closed-form or aggregate math rather than ticking step by step, then resume fine ticks from the result.

3. Show catch-up progress

If catch-up still takes a moment, display a brief progress indicator and keep the frame responsive, so a long absence feels like loading rather than a hang.

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.

The bug you can't reproduce isn't gone — it's just invisible until you capture it from the player's device.