How do I reduce my game's startup time?

Do less before first interaction: defer or background work that doesn't need to finish before the player can act, like loading later-level content and initializing not-yet-needed systems, parallelize startup steps instead of doing them serially, and only block on what the first screen actually requires. This gets the player into the game faster. Measure real startup times across the devices players use (not just your fast machine) to target the players who wait most and verify improvements.

What Causes Slow Startup Times?

Q: What causes slow startup times?

Slow startup comes from doing too much before the player can interact: loading all assets up front (when only the first screen's worth is needed), initializing every system eagerly before the player can act, heavy startup processing, slow storage, serial rather than parallel startup work, and large initial loads. The common cause is blocking first interaction on work that could be deferred or backgrounded, the player waits for things they don't need yet.

Q: Why does my game start slowly on players' devices but fast for me?

Because your dev machine is faster than typical player hardware, so startup work that's quick for you can take many times longer on an older or slower device. Slow startup is often far worse for players than your testing suggests, and it's the first thing they experience. The only way to know real startup times is to measure them in the field across the devices players use, then optimize for that reality.

Quick answer: Slow startup times come from doing too much before the player can interact: loading all assets up front, initializing every system before the first screen, heavy processing, and slow storage, work that blocks first interaction.

Slow startup, the wait from launching the game to being able to play, is a first impression that causes drop-off. It comes from doing too much before the player can do anything. Here's what causes slow startup times.

What Slows Down Startup

Startup is everything between launching and being playable, and slow startup comes from packing too much into that phase, much of it unnecessary before first interaction.

Loading everything up front, loading all assets or content at startup when only the first screen's worth is needed
Initializing all systems eagerly, setting up every system before the player can interact, even ones not yet needed
Heavy startup processing, expensive computation or setup during boot
Slow storage, reading startup data from a slow device
Synchronous, serial work, doing startup steps one after another instead of in parallel or deferred
Large initial loads, a big initial scene or data set that must fully load first

The common cause is blocking first interaction on work that could be deferred or done in the background, the player waits for things they don't need yet.

Why It's Worse on Players' Devices

Your dev machine is fast, so startup feels quick for you, while a player's older or slower device can take many times longer. So slow startup is often far worse for players than your testing suggests, and it's the first thing they experience.

Bugnet captures timing and performance data from real sessions across devices, so you see actual startup times in the field. Measuring real startup times, especially on slower devices, is where reducing them has to start, since your fast machine hides the problem.

Reducing Startup Time

The fix is doing less before first interaction: defer or background work that doesn't need to finish before the player can act (loading later content, initializing not-yet-needed systems), parallelize startup steps, and only block on what the first screen requires. This gets the player in faster.

Bugnet helps you see which devices have the slowest startup, so you target the players who wait most. So slow startup times come from loading and initializing too much up front, and the fix is deferring non-essential work so the player reaches first interaction quickly.

Slow startup comes from loading and initializing too much before first interaction, all assets up front, every system eagerly, on slow storage. Defer non-essential work so the player reaches first interaction fast.