Squid Game: Unleashed

20 emitters

~200 particles

4 emitters

~160 particles

In this case, the left system is the original fire for a grill hazard.  It consisted of 20 separate particle systems.  bottom glow, two sets of flames, and sparks for each individual fire.

Using two custom low-poly meshes as particle emitters, the same effect was achieved with just 4 emitters, and total particle count was reduced by ~20%.