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https://issues.apache.org/jira/browse/SOLR-10150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fabrizio Fortino updated SOLR-10150:
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    Attachment: Screen Shot 2017-02-16 at 17.31.02.png

> Solr 6.4 up to 10x slower than 6.3
> ----------------------------------
>
>                 Key: SOLR-10150
>                 URL: https://issues.apache.org/jira/browse/SOLR-10150
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Fabrizio Fortino
>              Labels: performance
>         Attachments: Screen Shot 2017-02-16 at 17.31.02.png
>
>
> We noticed a considerable performance degradation (5x to 10x) using Solr 6.4 
> and huge increase of CPU utilization. Our use case is pretty simple: we have 
> a single Solr Core with around 600K small size documents. We just do lookups 
> by key (no full text searches) and use faceting capabilities.
> Using the Solr Admin Thread Dump utilities we noticed a lot of threads using 
> considerable cpuTime / userTime on codehale metrics (snapshot attached). The 
> metrics part has been drastically changed in 6.4 
> (https://issues.apache.org/jira/browse/SOLR-4735). Rolling back to Solr 6.3 
> has solved our performance problems.
> Is there any way to disable these metrics in version 6.4 ?
> Thanks!



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