# Force merge reduced performance **URL:** \ **Category:** Elasticsearch\ **Created:** [January 11, 2019, 5:10am UTC](https://discuss.elastic.co/t/force-merge-reduced-performance/163838 "2019-01-11T05:10:10Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![nuwancs](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nuwancs/32/46419_2.png) [@nuwancs](https://discuss.elastic.co/u/nuwancs)\ **Post date:** [January 11, 2019, 5:10am UTC](https://discuss.elastic.co/t/force-merge-reduced-performance/163838/1 "2019-01-11T05:10:11Z")
Hi Team, I forced merged my index to reduce segment size from 82 to 5, with the hope of increasing the search performance. Dashboard load time for the same index was as follows, 82 segments - 10 seconds 5 segments - 250 seconds As per the documents referred performance should be increased, any idea for this behavior? My Data information 1 index only 5 shards 50 million docs Index size (primary) - 2 GB - after force merge - 3.5GB - before force merge Replicas - 1 My cluster information, Es, kibana - 6.3.0 version 3 node cluster 15gb 4 core 7gb heap 400Gb disk per node ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [January 11, 2019, 7:16am UTC](https://discuss.elastic.co/t/force-merge-reduced-performance/163838/2 "2019-01-11T07:16:24Z")
You should test your queries in the dev console and just look at the `took` field. Here you also have some browser rendering... Some comments: - one shard is probably enough for your dataset - test the search request multiple times as the OS cache is not used the very first time ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [February 8, 2019, 7:16am UTC](https://discuss.elastic.co/t/force-merge-reduced-performance/163838/3 "2019-02-08T07:16:25Z")
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