Building a mobile project in UE? Explore how in-engine profiling tools like Unreal Insights complement platform-native tools for iOS and Android, as well as when to use each type. Dive into mobile profiling in this tech thread based on Paul Georges’s recent Unreal Fest Chicago talk 🧵 You can... check out the full session here:show more

Use Unreal Insights to diagnose bottlenecks from inside the engine, then switch to platform-native tools to understand why they occur. Unreal Insights gives you the big picture, platform-native tools show the detail—like which functions are costing CPU time or limiting your GPU.

On iOS, Xcode and Instruments cover most of what you need to profile CPU, GPU, rendering, memory, and energy use to explore bottlenecks and optimize performance. Here, Paul shows which tools to use and when.

Android provides several platform-native profilers to choose from based on what you’re profiling and which device you’re on. Use them to assess CPU/GPU load and thermals, analyze thread scheduling and core contention, sample CPU call stacks, and diagnose GPU or frame bottlenecks.

When a phone runs hot, the OS can shut off performance cores and pin the GPU to the minimum frequency. Your profiling data could no longer match what players experience. That means it’s important to pay attention to different thermal states to ensure accurate player experience.

Check out the UE 5.8 documentation to learn more about profiling mobile projects: ⚫Android: ⚫iOS:

@paulgeorgesepic great profile tool.

@paulgeorgesepic This is awesome to see I love oceanhorn 3 as well

@paulgeorgesepic I've already tested the Substrate version (5.6-5.8). As soon as I enable two ray tracing settings in semi-transparent mode, the Niagara effect immediately becomes bugged and malfunctions, disappearing completely...

@paulgeorgesepic Why hasn't the serious incompatibility bug between the two ray tracing functions in the semi-transparent mode and the Niagara particle effect and materials with masked textures been resolved yet...?

@paulgeorgesepic In UE5, the Niagara particle effect suffers from a long-standing and severe incompatibility bug with PostProcessVolume: enabling Translucency (ray tracing mode) causes the Niagara particle effect to malfunction and become undetectable. When will this major bug be fixed...?

@paulgeorgesepic ---Selecting the semi-transparent mode: One out of two ray tracing options is selected; however, many semi-transparent materials with masks or overlays also experience a major bug where they disappear completely