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One very common problem Ruby and Rails have is memory usage. Often when hosting sites the bottleneck is memory not performance. At Discourse we spend a fair amount of time tuning our application so self hosters can afford to host Discourse on 1GB droplets. To help debug memory usage I created the memory_profiler gem, it allows you to easily report on application memory usage. I highly recommend you give it a shot on your Rails app, it is often surprising how much low hanging fruit there is. On u...