# Nodes reporting big difference in average took\_millis on same data

**URL:** <https://discuss.elastic.co/t/nodes-reporting-big-difference-in-average-took-millis-on-same-data/52470>\
**Category:** Elasticsearch\
**Created:** [June 10, 2016, 6:33pm UTC](https://discuss.elastic.co/t/nodes-reporting-big-difference-in-average-took-millis-on-same-data/52470 "2016-06-10T18:33:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![esvetst](https://avatars.discourse-cdn.com/v4/letter/e/a183cd/32.png) [@esvetst](https://discuss.elastic.co/u/esvetst)\
**Post date:** [June 10, 2016, 6:33pm UTC](https://discuss.elastic.co/t/nodes-reporting-big-difference-in-average-took-millis-on-same-data/52470/1 "2016-06-10T18:33:44Z")

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Hi! I do a load test with 4 shards index ,1 shard per node. After the test I take the average of took\_millis from slow query logs (I log queries that take longer than 1ms, so all queries) per per node and see something like this:  
node1: 800ms  
node2: 200 ms  
node3: 200 ms  
node4: 400 ms

I then swap the shards of node1 and node2 and the shards of node3 and node4, run the test again with same queries, also on a different day, and still see that node1's times are 4 times higher than node2 and node3. What could be the reason for this? The nodes are VMs so I suspect that CPUs perform differently and we are investigating this. Is this a reasonable thing to suspect and what else could I do to get equal performance? Thanks for your suggestions!

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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, 10:44pm UTC](https://discuss.elastic.co/t/nodes-reporting-big-difference-in-average-took-millis-on-same-data/52470/2 "2017-07-05T22:44:41Z")

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