Quick answer: Unreal Niagara CPU emitter logging loop count overflow warnings? CPU modules cap iterations per step to prevent infinite loops; restructure logic or move to GPU sim.
A particle system with iterative per-particle calculations triggers loop overflow warnings every frame. Niagara’s safety cap is fighting the design.
Cap by Design
Niagara modules have a per-step max iteration count (default 32). Loops past that abort — the safety prevents infinite loops in user scripts.
Restructure to Vectorize
Replace iterative passes with single vectorized ops. For example, instead of looping to compute force, use a single Add Force module — Niagara handles it across particles efficiently.
GPU Sim for Heavy Math
If logic requires more compute, switch to GPU sim. GPU emitters don’t have the same iteration cap — SIMD makes it cheap.
Custom HLSL
For specialized math, custom HLSL nodes bypass the high-level loop cap but with raw shader limits. Use for shipping-quality effects, not prototyping.
Verifying
No loop overflow warnings. Effect runs at expected frame cost; visuals match design intent.
“Niagara CPU loops are capped. Vectorize, go GPU, or use custom HLSL.”
Profile Niagara emitters with stat fps and stat unit — CPU emitters with loops are easy to write but blow your frame budget at scale.