Tool selector

Question	Start with	Escalate to
Which side owns the frame?	stat unit, stat unitgraph	Timing Insights + GPU events
Which CPU scope/thread is slow?	Timing Insights CPU tracks	task/context-switch trace, custom scopes
Which GPU pass is slow?	stat gpu, profilegpu	GPU trace, RenderDoc/platform profiler
Why did one frame hitch?	stat unitgraph, bookmark	Timing Insights, load/file/GC tracks
Why is memory growing?	platform/LLM stats	Memory Insights from process start
Which asset loaded or blocked?	async-loading stats	Asset Loading Insights + file/loadtime channels
What consumes bandwidth?	stat net where applicable	Networking Insights packet/content/stats
Are tasks waiting or serialized?	CPU trace	Task Graph + context-switch channels
Is UI/Slate expensive?	stat slate, stat ui	Slate trace/Insights tracks
Did a change regress?	repeatable stat/trace capture	exported timer statistics in CI

Use RenderDoc or a platform graphics debugger for pipeline/resource correctness inside one frame; use Insights and profilegpu to decide which frame/pass deserves that inspection.