# Heap Memory Not Used

**URL:** <https://discuss.elastic.co/t/heap-memory-not-used/47933>\
**Category:** Elasticsearch\
**Created:** [April 20, 2016, 3:57pm UTC](https://discuss.elastic.co/t/heap-memory-not-used/47933 "2016-04-20T15:57:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![nnnnathann](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nnnnathann/32/8391_2.png) [@nnnnathann](https://discuss.elastic.co/u/nnnnathann)\
**Post date:** [April 20, 2016, 3:57pm UTC](https://discuss.elastic.co/t/heap-memory-not-used/47933/1 "2016-04-20T15:57:46Z")

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Hi everyone,

I'm getting some slow performance with Elasticsearch, and I have noticed after some performance tweaking that the heap\_used\_percent is very low on each node (\< 10%)

I'm pretty new to production Elasticsearch and trying to figure out what is causing my aggregations to take 4-7 seconds.

I'm running a 3 node cluster with 4G ram each, with max heap set to 2g on each node.

Thanks for any advice!  
nathan

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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:** [July 5, 2017, 10:57pm UTC](https://discuss.elastic.co/t/heap-memory-not-used/47933/2 "2017-07-05T22:57:39Z")

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Closed on July 5, 2017, 10:57pm UTC