Save this to ~/.rvm/hooks/ to tweak the GC (reducing the number of times it runs) for REE under RVM

after_use

echo "RVM - using $rvm_ruby_string"

case "$rvm_ruby_string" in
  ree*)
    export RUBY_GC_MALLOC_LIMIT=50000000
    export RUBY_HEAP_MIN_SLOTS=1250000
    export RUBY_HEAP_SLOTS_GROWTH_FACTOR=1
    export RUBY_HEAP_SLOTS_INCREMENT=500000
    echo "Garbage collection tweaked"
  ;;

  *)
    unset RUBY_HEAP_MIN_SLOTS RUBY_HEAP_SLOTS_INCREMENT RUBY_HEAP_SLOTS_GROWTH_FACTOR RUBY_GC_MALLOC_LIMIT RUBY_HEAP_FREE_MIN
  ;;
esac