I did an 'Smalltalk allClasses collect:[:cl | cl -> cl allInstances size]' before starting a load and right after a load that just does not crash the image. I noticed the following number of new instances that were still being referenced (i.e. not garbage collected). The following lists the number of _added_ instances during the load with the largest first. I include all of them but some are obviously more indicative than others. Float->3580540 Point->2149989 Rectangle->818991 Array->573089 MorphExtension->309932 TableLayoutProperties->204571 ByteString->108891 OrderedCollection->107527 IdentityDictionary->103768 ImageMorph->102338 StringMorph->102318 Morph->102313 DependentsArray->102309 TableLayout->102308 RowLayout->102259 MorphTreeNodeMorph->102252 PackageTreePackageNodeModel->102250 Association->26405 Duration->14081 CompiledMethod->11191 MethodChangeRecord->11131 IdentitySet->10843 ....