Here is my observation:

1) If I start individual features in a fresh controller they normally take less than 30 secs to bring in. There are some yang-parser meesages like below but they go very quick.

2016-02-03 10:37:40,667 | INFO | l for user karaf | YangTextSchemaContextResolver | 78 - org.opendaylight.yangtools.yang-parser-impl - 0.8.0.SNAPSHOT | Provided module name /META-INF/yang/ietf-netconf-notifications@2012-02-06.yang@0000-00-00.yang does not match actual text ietf-netconf-notifications@2012-02-06.yang, corrected

Example of single feature install:

feature:install odl-bgpcep-bgp-all takes ~ 30 secs

2) If I start to add features on top of others, the yang-parser messages start to appear very slow, CPU and memory goes very high, and the overall feature installation takes very long.

Example bring same feature (took 30 secs before) after another:

feature:install odl-ovsdb-openstack takes ~ 30 secs
feature:install odl-bgpcep-bgp-all takes ~ 5 mins!!!

I have experienced same delays + high CPU/memory mixing other features, so this is not just related to the example features.

This may not be a blocker but the user experience is pretty much impacted.

BR/Luis