# Indexing performance degrading over time

**URL:** <https://discuss.elastic.co/t/indexing-performance-degrading-over-time/40229>\
**Category:** Elasticsearch\
**Created:** [January 27, 2016, 12:30pm UTC](https://discuss.elastic.co/t/indexing-performance-degrading-over-time/40229 "2016-01-27T12:30:27Z")\
**Posts on this page:** 1\
**Showing post:** 50

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**Author:** ![ivank](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ivank/32/7595_2.png) [@ivank](https://discuss.elastic.co/u/ivank)\
**Post date:** [March 23, 2016, 5:17pm UTC](https://discuss.elastic.co/t/indexing-performance-degrading-over-time/40229/50 "2016-03-23T17:17:27Z")

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We have changed GC from G1 to default (not CMS), and problem disappeared, it seems... Of course, log now has entries from GC about long duration (5-10s), but... cluster works normal, indexing speed is 100M/5min with low LA... Sounds strange.  
We decided to switch GC to CMS and later to G1 again to see if the problem will return.

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