# CSV mutate system load

**URL:** <https://discuss.elastic.co/t/csv-mutate-system-load/86783>\
**Category:** Logstash\
**Created:** [May 23, 2017, 9:09am UTC](https://discuss.elastic.co/t/csv-mutate-system-load/86783 "2017-05-23T09:09:23Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mitabrev](https://avatars.discourse-cdn.com/v4/letter/m/a88e57/32.png) [@mitabrev](https://discuss.elastic.co/u/mitabrev)\
**Post date:** [May 23, 2017, 9:09am UTC](https://discuss.elastic.co/t/csv-mutate-system-load/86783/1 "2017-05-23T09:09:23Z")

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Hi dear friends,

Got one quick question about mutations.  
I'm parsing CSV log files with logstash and would like to "mutate" some filed values if matching a string.  
So basically a conf file would containg about 30-40 mutations.  
My question, is this a big thing for logstash engine, will it have troubles processing it or should it be ok?

thank you all!

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [June 20, 2017, 9:09am UTC](https://discuss.elastic.co/t/csv-mutate-system-load/86783/2 "2017-06-20T09:09:28Z")

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