(edited) (we’re using AdoptOpenJDK11.0.2 with JRuby 9.2.7.0. The JVM is hot) => we profiled (with async-profiler, cpu mode) our app and here’s the results:

```
          ns  percent  samples  top
  ----------  -------  -------  ---
 28729216493   12.47%     2871  /opt/java/openjdk/lib/server/libjvm.so
 10217190275    4.44%     1021  java.lang.invoke.MethodHandle.invokeBasic
  3722712907    1.62%      372  vtable stub
  3032384580    1.32%      303  java.util.concurrent.ConcurrentHashMap.get
  2862104438    1.24%      286  org.jruby.runtime.callsite.CachingCallSite.call
  2682040958    1.16%      268  org.jruby.runtime.Frame.updateFrame
  2121434455    0.92%      212  org.jruby.internal.runtime.methods.MixedModeIRMethod.call
  2061147509    0.89%      206  org.jruby.internal.runtime.methods.AttrReaderMethod.call
  2051277047    0.89%      205  org.jruby.RubyBasicObject.getMetaClass
  1951522254    0.85%      195  org.jruby.RubyModule.cacheHit
  1841358302    0.80%      184  vtable stub
  1690965900    0.73%      169  org.jruby.util.PerlHash.hash
  1621307538    0.70%      162  org.jruby.internal.runtime.methods.CompiledIRMethod.call
  1621031882    0.70%      162  org.jruby.RubyHash.internalGetEntry
  1521156025    0.66%      152  java.lang.invoke.LambdaForm$MH.1164442411.invoke_MT
  1440751770    0.63%      144  org.jruby.RubyModule.isSame
  1330799359    0.58%      133  org.jruby.RubyBasicObject.<init>
  1260768385    0.55%      126  org.jruby.runtime.callsite.CachingCallSite.call
  1241011867    0.54%      124  org.jruby.internal.runtime.methods.CompiledIRMethod.call
  1230944741    0.53%      123  java.util.HashMap.getNode
  1220779744    0.53%      122  org.jruby.internal.runtime.methods.CompiledIRMethod.call
  1180966546    0.51%      118  java.lang.invoke.Invokers.checkCustomized
  1150728525    0.50%      115  itable stub
  1090574573    0.47%      109  vtable stub
  1060674542    0.46%      106  org.jruby.runtime.callsite.CacheEntry.typeOk
  1060611347    0.46%      106  org.jruby.internal.runtime.methods.DynamicMethod.call
  1050687618    0.46%      105  org.jruby.runtime.Frame.setVisibility
  1030962171    0.45%      103  java.lang.StringLatin1.hashCode
  1020743297    0.44%      102  org.jruby.runtime.ivars.FieldVariableAccessor.get
  1020425054    0.44%      102  org.jruby.RubyModule.searchAncestor
  1020343689    0.44%      102  org.jruby.IncludedModuleWrapper.isSame
  1000741887    0.43%      100  java.lang.invoke.MethodHandle.asTypeCached
   970668521    0.42%       97  org.jruby.ir.runtime.IRRuntimeHelpers.getVariableWithAccessor
   950504614    0.41%       95  org.jruby.runtime.ThreadContext.pushScope
   920572710    0.40%       92  org.jruby.runtime.BlockBody.yield
   920556638    0.40%       92  com.headius.options.Option.load
   880671886    0.38%       88  org.jruby.internal.runtime.methods.MixedModeIRMethod.tryJit
   863699817    0.37%       86  __lock_text_start_[k]
   820735763    0.36%       82  java.lang.invoke.Invokers$Holder.invokeExact_MT
   800523879    0.35%       80  org.jruby.internal.runtime.methods.CompiledIRMethod.call
   800515916    0.35%       80  org.jruby.RubyClass.getVariableAccessorForRead
   800456342    0.35%       80  org.jruby.runtime.ThreadContext.pushFrame
   790363144    0.34%       79  org.jruby.runtime.Binding.<init>
   770495498    0.33%       77  org.jruby.RubyBasicObject.getMetaClass
   730496540    0.32%       73  org.jruby.parser.StaticScope.acquireConstructor
   720512263    0.31%       72  org.jruby.internal.runtime.methods.MixedModeIRMethod.call
   710199514    0.31%       71  org.jruby.RubyModule.getDelegate
   680384339    0.30%       68  itable stub
   670568969    0.29%       67  java.util.concurrent.ConcurrentHashMap.spread
   670319469    0.29%       67  org.jruby.RubyModule$JavaClassKindOf.isKindOf
   630511811    0.27%       63  org.jruby.runtime.ivars.VariableAccessor.verify
   630344013    0.27%       63  org.jruby.internal.runtime.methods.DynamicMethod.isRefined
   620819029    0.27%       62  /lib/x86_64-linux-gnu/ld-2.27.so
```