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https://issues.apache.org/jira/browse/COUCHDB-2724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14601064#comment-14601064
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Robert Newson commented on COUCHDB-2724:
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[~kocolosk] Are you ready for this to be reviewed/merged? We've gravitated 
towards using PR's on the github mirrors but I can deal with these as-is if 
it's appropriate to review this now.

> Batch rows in streaming responses to improve throughput
> -------------------------------------------------------
>
>                 Key: COUCHDB-2724
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-2724
>             Project: CouchDB
>          Issue Type: Improvement
>      Security Level: public(Regular issues) 
>          Components: Database Core, HTTP Interface
>            Reporter: Adam Kocoloski
>            Assignee: Adam Kocoloski
>
> [~tonysun83] showed me some profiling of the {{_changes}} feed which 
> indicated that the coordinator process was spending about 1/3 of its time 
> executing inside {{send_delayed_chunk}}. We can reduce the number of 
> invocations of this function by buffering individual rows until we reach a 
> (configurable) threshold for sending the data out the wire.
> We'll of course want to be careful about continuous feeds; if we're in the 
> "slow drip" portion of the feed we'll obviously want to emit right away 
> instead of adding latency unnecessarily.



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