performance - Heroku web dynos often slowing down but never getting more than 20% load? -

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a couple of times day see response time of 1 of our heroku web dynos increase tremendously. have been analyzing little success far.

one strange thing see, however, following. @ "instances running" graph new relic: heoku instances running

you see we've played around number of web dyno's, majority of time have had 2 dynos 4 unicorn processes each. never ever these instances seem "full load". how should interpret this? @ time sum of cpu usage of instances never exceeds approx. 20%? , if so, seems we're underutilizing our dynos. can optimize here?

for clarity: average memory usage constant between 110mb , 120mb, not seem bottleneck.

have seen http://news.rapgenius.com/james-somers-herokus-ugly-secret-lyrics ?

heroku has worked on addressing this, you'll need talk them further recommendations.


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