Monte-Carlo setup:

- Throwing one photon/electron per event
- y2009 geometry tag (EEMC geometry v6.1)
- Full STAR geometry configurations
**with and without LOW_EM option** - Throwing particles flat in eta (1.08, 2.0), phi (0, 2pi), and energy (5-35 GeV)
- ~50K/per particle type, 250 events per job, 200 jobs

Geometry configurations

**red**: without LOW_EM option**black**: with LOW_EM option- circles - electrons, squares - photons

**Figure 1:** (left) time/event distribution, (right) average time for the particle type

**Conclusion**: for single particle Monte-Carlo required time in starsim

with LOW_EM option is ~ 2.6 times higher.