# OpenMC eigenvalue simulation on MSBR model has long simulation time compared to Serpent

**URL:** <https://openmc.discourse.group/t/openmc-eigenvalue-simulation-on-msbr-model-has-long-simulation-time-compared-to-serpent/2359>\
**Category:** User Support\
**Created:** [October 13, 2022, 6:23pm UTC](https://openmc.discourse.group/t/openmc-eigenvalue-simulation-on-msbr-model-has-long-simulation-time-compared-to-serpent/2359 "2022-10-13T18:23:02Z")\
**Posts on this page:** 1\
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**Author:** ![AnthonyB08](https://avatars.discourse-cdn.com/v4/letter/a/e36b37/32.png) [@AnthonyB08](https://openmc.discourse.group/u/AnthonyB08)\
**Post date:** [February 2, 2023, 11:13pm UTC](https://openmc.discourse.group/t/openmc-eigenvalue-simulation-on-msbr-model-has-long-simulation-time-compared-to-serpent/2359/5 "2023-02-02T23:13:40Z")

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Hi oyardas2,

May I ask how you developed such a geometry.xml file? What software did you use and if possible how did you import it , i.e dagmcUniverise?

I am struggling to create a custom geometry my forum post : [DAGMC Geometry Assitance](https://openmc.discourse.group/t/dagmc-geometry-assitance/2676)

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