# Simulation speed reduction due to Control / Discrete blocks
**URL:** https://forum.plexim.com/t/simulation-speed-reduction-due-to-control-discrete-blocks/729
**Category:** PLECS
**Tags:** performance, simulation-time, plecs-standalone
**Created:** [January 7, 2020, 6:04am UTC](https://forum.plexim.com/t/simulation-speed-reduction-due-to-control-discrete-blocks/729 "2020-01-07T06:04:27Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@tinivella](https://forum.plexim.com/u/tinivella)
#### Post date: [January 7, 2020, 6:04am UTC](https://forum.plexim.com/t/simulation-speed-reduction-due-to-control-discrete-blocks/729/1 "2020-01-07T06:04:27Z")
Dear all,
I noticed that the same simulation pass from 2s simulation to 25sec when I let PLECS calculate the Discrete mean value and the discrete RMS, is it possible that?
How can I improve it?
Attached the files
[bst\_UV2W\_IPmod\_noBlocks.plecs](https://forum.plexim.com/uploads/short-url/dmrQa8Oaw3AYuQpR9NlhbXaxOz.plecs) (86.8 KB)
[bst\_UV2W\_IPmod\_mitBlocks.plecs](https://forum.plexim.com/uploads/short-url/lzXBEQBY7fvxXYPkSPQJaBV38Sc.plecs) (88.8 KB)
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### Author:  [@malepatisankar](https://forum.plexim.com/u/malepatisankar)
#### Post date: [January 7, 2020, 6:19am UTC](https://forum.plexim.com/t/simulation-speed-reduction-due-to-control-discrete-blocks/729/2 "2020-01-07T06:19:27Z")
Hi.
The blocks mentioned do consume a lot of time for computation when “sample time” is too low and/or “Number of samples” is too high. Try adjusting them and I feel that it is the compromise between “accuracy” and “time”.
Bhavani.
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### Author:  [@Kris\_Eberle](https://forum.plexim.com/u/Kris_Eberle)
#### Post date: [January 14, 2020, 3:15pm UTC](https://forum.plexim.com/t/simulation-speed-reduction-due-to-control-discrete-blocks/729/3 "2020-01-14T15:15:57Z")
Hello,
The additional discrete states can slow down the simulation. We are addressing this in our next release with variable step/continuous RMS and THD blocks that will not cause the simulation speed issue.
Thank you,
Kris
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### Author:  [@tinivella](https://forum.plexim.com/u/tinivella)
#### Post date: [January 15, 2020, 3:09am UTC](https://forum.plexim.com/t/simulation-speed-reduction-due-to-control-discrete-blocks/729/4 "2020-01-15T03:09:23Z")
thanks for the answer and for the support of @lino\_capponi
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### Author:  [@tinivella](https://forum.plexim.com/u/tinivella)
#### Post date: [February 12, 2020, 4:24pm UTC](https://forum.plexim.com/t/simulation-speed-reduction-due-to-control-discrete-blocks/729/5 "2020-02-12T16:24:20Z")
there is a bug in the RMS block you sent to me, the reason is not clear be seems something with the initial buffer
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### Author:  [@Kris\_Eberle](https://forum.plexim.com/u/Kris_Eberle)
#### Post date: [February 12, 2020, 5:39pm UTC](https://forum.plexim.com/t/simulation-speed-reduction-due-to-control-discrete-blocks/729/6 "2020-02-12T17:39:36Z")
Hello, can you please continue your email discussion with Lino about this?
Thank you,
Kris