Disable Transparent Huge Pages (THP) https://bugs.ruby-lang.org/issues/14705 https://blog.nelhage.com/post/transparent-hugepages/ Use jemalloc or set MALLOC_ARENA_MAX = 2 https://bugs.ruby-lang.org/issues/14718 https://bugs.ruby-lang.org/issues/14759 https://mikeperham.com/2018/04/25/taming-rails-memory-bloat