# Resharindg, Hyperthreading and ScyllaDB performance

**URL:** <https://forum.scylladb.com/t/resharindg-hyperthreading-and-scylladb-performance/4837>\
**Category:** ScyllaDB\
**Tags:** performance, resharding, hyperthreading\
**Created:** [May 17, 2025, 3:54pm UTC](https://forum.scylladb.com/t/resharindg-hyperthreading-and-scylladb-performance/4837 "2025-05-17T15:54:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Guy](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.scylladb.com/guy/32/9_2.png) [@Guy](https://forum.scylladb.com/u/Guy)\
**Post date:** [May 17, 2025, 3:54pm UTC](https://forum.scylladb.com/t/resharindg-hyperthreading-and-scylladb-performance/4837/1 "2025-05-17T15:54:03Z")

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> [@](#):
>
> [**Originally from the User Slack**](https://slack.scylladb.com/)
> 
> ![Mahdi_Kamali](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/2X/7/7fb1a0a118e8eb1518763300c376e9c0ce9db7bc.png) **@Mahdi\_Kamali:** Is hyper threading good for ScyllaDB performance? Does it have too much effect?
> 
> ![avi](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/1X/b5e08becda8d9df1abff1d3a2d9ffe1126ac3fc6.jpeg) **@avi:** We think it has a small positive effect, but long time since we last tested it
> 
> ![Mahdi_Kamali](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/2X/7/7fb1a0a118e8eb1518763300c376e9c0ce9db7bc.png) **@Mahdi\_Kamali:** Thanks for your previous answer @avi.  
> I am having trouble resharding production nodes. When a node is resharded, the cluster performance drops drastically. I think the communication between nodes becomes slower.  
> What is the solution?
> 
> ![avi](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/1X/b5e08becda8d9df1abff1d3a2d9ffe1126ac3fc6.jpeg) **@avi:** When a node is resharded it’s offline, so it doesn’t affect cluster performance (apart from the fact that it doesn’t serve requests)