# Does convention of in- & output params to groups adds computation time?

**URL:** <https://discourse.mcneel.com/t/does-convention-of-in-output-params-to-groups-adds-computation-time/147973>\
**Category:** Grasshopper\
**Tags:** windows, mac, rhino7, metahopper\
**Created:** [September 19, 2022, 11:33am UTC](https://discourse.mcneel.com/t/does-convention-of-in-output-params-to-groups-adds-computation-time/147973 "2022-09-19T11:33:35Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![cfee](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/cfee/32/649102_2.png) [@cfee](https://discourse.mcneel.com/u/cfee)\
**Post date:** [September 19, 2022, 11:33am UTC](https://discourse.mcneel.com/t/does-convention-of-in-output-params-to-groups-adds-computation-time/147973/1 "2022-09-19T11:33:35Z")

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I always find it a good practise to have input and output params at both edges for any data that goes outside the group. Metahopper even has a component to do this.

 ![Screenshot 2022-09-19 at 13.28.04](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/9/0/7/9072568236db81b0e2c764aeda2f7bb4ff3075d8.png)  
vs  
 ![Screenshot 2022-09-19 at 13.28.11](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/7/e/0/7e083b469d0611d44da9f3fa85c1d65a6614db59.png)

Does this actually increase computation time? And if so, is there a method or a rule of thumb to establish how the amount of % of the total computational time this actually is?

In my script i have have probably over 200 of such params.