Your Unity game runs perfectly on the developer's phone.
Then you install it on a three-year-old budget Android device.
Suddenly:
Long loading times
Random stutters
App crashes
Textures disappearing
Aggressive garbage collection
The problem isn't always CPU or GPU performance.
Sometimes, you're simply using too much memory.
That's why Unity memory profiling should happen on your lowest target hardware—not only inside the Editor.
Here's a practical way to approach it.
Start With a Memory Budget
Don't begin optimization with:
“Let's reduce memory.”
Start with a measurable target.
Think of runtime memory as several buckets:
Total Memory
│
├── Textures
├── Meshes
├── Audio
├── Managed Heap
├── Native Memory
├── Render Targets
└── Other Engine Resources
On low-end devices, every category matters.
A useful rule is:
Design for the weakest supported device, then scale quality upward.
Profile a Real Build
One of the biggest mistakes is judging memory only from the Unity Editor.
The Editor has additional overhead and doesn't represent the exact environment your users will run.
Instead:
Development Build
↓
Target Device
↓
Unity Profiler
↓
Memory Profiler
↓
Capture Snapshot
Test the actual scenarios that matter:
Launch game
Load main menu
Enter gameplay
Play several minutes
Change levels
Return to menu
Repeat
We're not just looking for high memory.
We're looking for memory that keeps growing.
Compare Memory Snapshots
One snapshot tells you what exists.
Two snapshots can tell you what didn't disappear.
For example:
Snapshot A
Enter Level
Memory: X
↓
Exit Level
↓
Snapshot B
Memory: X + unexpected growth
Now investigate.
Maybe:
Textures remain referenced
GameObjects weren't destroyed
AssetBundles weren't unloaded
Static collections retained objects
Event subscriptions remain active
This is where profiling becomes much more useful than guessing.
Check Textures First
Textures can consume a significant part of a mobile game's memory.
A source image may look harmless in the project folder, but runtime texture memory depends on things such as:
Resolution
Compression format
Mipmaps
Read/Write settings
Platform overrides
Ask whether a mobile UI icon really needs a huge source resolution.
Likewise, background assets that are never viewed closely don't necessarily need desktop-quality textures.
For projects targeting a wide range of devices, performance planning should therefore be part of the overall Unity game development process rather than something postponed until release.
Watch Duplicate Assets
Sometimes the problem isn't one huge asset.
It's duplication.
You might discover:
Texture_A
Texture_A
Texture_A
Texture_A
loaded through different paths or asset dependencies.
Memory snapshots help reveal which objects are alive and what is referencing them.
Instead of asking:
“Why is memory high?”
ask:
“Why is this object still alive?”
That question is usually much more actionable.
Be Careful With Managed Allocations
Memory problems aren't limited to textures.
Repeated C# allocations can increase garbage collection pressure.
For example, code running every frame deserves extra attention:
void Update()
{
// Avoid unnecessary allocations here.
}
Look for patterns involving:
Temporary Lists
String creation
LINQ in hot paths
Repeated object creation
Boxing
Large temporary arrays
Not every allocation is bad.
The goal is to avoid unnecessary recurring allocations in performance-critical paths.
Use Object Pooling Where It Makes Sense
Imagine an action game constantly creating and destroying:
Bullets
Enemies
Particles
Damage indicators
Instead of:
Instantiate
Destroy
Instantiate
Destroy
Instantiate
Destroy
we can reuse objects:
Create Pool
↓
Get Object
↓
Use Object
↓
Return to Pool
↓
Reuse
Pooling isn't a universal solution, but it can reduce allocation churn for frequently reused objects.
Test Level Transitions
One of my favorite memory tests is simple:
Main Menu
↓
Level
↓
Main Menu
↓
Level
↓
Main Menu
Watch memory after every transition.
If the baseline becomes:
300 MB
340 MB
390 MB
450 MB
520 MB
something deserves investigation.
If memory returns near the expected baseline after resources are released, that's much healthier.
Test on the Device You Actually Fear
Don't make your oldest test device an afterthought.
Use it continuously.
A good device matrix might look like:
| Device | Purpose |
|---|---|
| Low-end | Memory/performance baseline |
| Mid-range | Typical experience |
| High-end | Maximum-quality validation |
This matters especially for Android, where hardware configurations vary widely. A mobile-focused Android game development workflow should therefore include testing and profiling across budget as well as higher-end devices.
A Simple Unity Memory Profiling Checklist
Before release, I want answers to these:
□ Tested on real low-end hardware
□ Captured memory snapshots
□ Compared before/after snapshots
□ Checked large textures
□ Checked duplicate assets
□ Reviewed audio memory
□ Reviewed managed allocations
□ Tested scene transitions
□ Checked object references
□ Tested long gameplay sessions
□ Tested repeated level loads
□ Monitored memory growth
The important part isn't checking boxes.
It's establishing a repeatable baseline.
Final Takeaway
Memory optimization shouldn't begin when low-end users start reporting crashes.
Build it into development:
PROFILE
↓
IDENTIFY
↓
MEASURE
↓
OPTIMIZE
↓
PROFILE AGAIN
And don't optimize based on assumptions.
The biggest texture isn't necessarily your biggest problem.
The most complicated script isn't necessarily leaking memory.
The Editor isn't necessarily showing what happens on a real phone.
Good Unity memory profiling is about measuring the actual build on actual target hardware and finding out exactly where your memory goes.
Because on a low-end device, the difference between:
"It works on my phone."
and:
"It works on our players' phones."
is often profiling.
