wohali commented on issue #1409: Network performance issue (30 secs for 8mb 
PUT) 
URL: https://github.com/apache/couchdb/issues/1409#issuecomment-400016592
 
 
   @stevedrew this isn't the root cause for CouchDB's slow attachment behaviour 
universally, no. A lot of that slowness comes from the serialisation of 
attachment data both into the b-tree and over the wire. Internal attachment 
replication between nodes in a 2.x cluster is also unoptimized, and can block 
other operations on very large files, leading to database-wide issues.
   
   We still recommend keeping attachments in CouchDB below 10MB per document, 
which you have already met, hooray! There is an ongoing discussion about how to 
help guide users towards these defaults, see 
https://github.com/apache/couchdb/pull/1200 and 
https://github.com/apache/couchdb/pull/1253.

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