# Delayed summed variable : advice for performance in runtime mode

**URL:** <https://brian.discourse.group/t/delayed-summed-variable-advice-for-performance-in-runtime-mode/589>\
**Category:** Support\
**Tags:** performance, synapses\
**Created:** [21 January 2022 00:33 UTC](https://brian.discourse.group/t/delayed-summed-variable-advice-for-performance-in-runtime-mode/589 "2022-01-21T00:33:49Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![mstimberg](https://yyz2.discourse-cdn.com/free1/user_avatar/brian.discourse.group/mstimberg/32/11_2.png) [@mstimberg](https://brian.discourse.group/u/mstimberg)\
**Post date:** [22 January 2022 17:36 UTC](https://brian.discourse.group/t/delayed-summed-variable-advice-for-performance-in-runtime-mode/589/7 "2022-01-22T17:36:32Z")

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> [@rth](#):
>
> I also implemented the same silly test for `cython` and `cpp` , but both returns an error:

This seems to be the same issue as in [Problem with cython using Ubuntu 20.04](https://brian.discourse.group/t/problem-with-cython-using-ubuntu-20-04/580/), not quite sure what is going on. Some mismatch between the compiler that is used and the compiler flags that are set, e.g. via a conda environment?

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