Unreal Engine Unreal Engine Performance Optimization & Profiling

Question 1

Which Unreal Engine built-in tool provides a hierarchical CPU and GPU timing breakdown of a single frame to identify performance bottlenecks?

Accepted Answer

Unreal Insights (Session Frontend)

Answer

Unreal Insights captures detailed CPU/GPU timing traces with a hierarchical view for identifying per-system frame bottlenecks.

Question 2

What does the console command `stat fps` display in Unreal Engine?

Accepted Answer

Current frames per second and frame time in milliseconds

Answer

`stat fps` overlays the current FPS and frame time (ms) directly on the viewport for quick real-time performance monitoring.

Question 3

What is the purpose of Level of Detail (LOD) meshes in Unreal Engine?

Accepted Answer

Swap high-poly meshes for lower-poly versions as the camera distance increases

Answer

LODs substitute progressively simpler mesh versions at greater camera distances to reduce GPU vertex processing cost.

Question 4

Which Unreal Engine feature automatically merges nearby static mesh draw calls into a single draw call to reduce CPU rendering overhead?

Accepted Answer

Instanced Static Meshes (ISM / HISM)

Answer

Instanced Static Mesh and Hierarchical Instanced Static Mesh components batch identical meshes into a single draw call, dramatically reducing CPU overhead.

Question 5

What does the Unreal Engine console command `r.ScreenPercentage 50` do?

Accepted Answer

Renders the scene at 50% of the screen resolution then upscales

Answer

`r.ScreenPercentage` sets the internal render resolution as a percentage of the output resolution, with values below 100 reducing GPU cost via upscaling.

Unreal Engine Practice Test

Unreal Engine Practice Test

Unreal Engine Unreal Engine Performance Optimization & Profiling