# \#real-time-simulation

**URL:** https://community.opal-rt.com/tag/real-time-simulation/118.md

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## [In RT-LAB, what's the difference between Normal, Accelerator, and Real-Time execution?](https://community.opal-rt.com/t/in-rt-lab-whats-the-difference-between-normal-accelerator-and-real-time-execution/134)

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**Author:** [@Arno](https://community.opal-rt.com/u/Arno)\
**Replies:** 2\
**Last updated:** [July 22, 2026, 3:43pm UTC](https://community.opal-rt.com/t/in-rt-lab-whats-the-difference-between-normal-accelerator-and-real-time-execution/134 "2026-07-22T15:43:12Z")

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Hi, I’m new to RT-LAB. Can someone explain when I should use Simulink Normal mode, Accelerator mode, and Real-Time execution? Thanks!