Without patch:

Scenario 'org.eclipse.jdt.ui.tests.performance.views.TypeHierarchyPerfTest#testOpenObjectHierarchy()' (average over 1 samples):
  Used Java Heap: 365.42K
  Working Set: 3.71M
  Committed: 3.04M
  Working Set Peak: 3.81M
  Elapsed Process: 7.15 s
  Kernel time: 881 ms
  Page Faults: 1.47K
  CPU Time: 2.63 s
  GDI Objects: 93

Scenario 'org.eclipse.jdt.ui.tests.performance.views.TypeHierarchyPerfTest#testOpenCollHierarchy()' (average over 1 samples):
  Used Java Heap: -210952
  Working Set: 1.75M
  Committed: 4.33M
  Working Set Peak: 1.76M
  Elapsed Process: 1.16 s
  Kernel time: 170 ms
  Page Faults: 562
  CPU Time: 1.13 s
  GDI Objects: 12

Scenario 'org.eclipse.jdt.ui.tests.performance.views.TypeHierarchyPerfTest#testOpenObjectHierarchy2()' (average over 1 samples):
  Used Java Heap: 3.3M
  Working Set: 1.21M
  Committed: 252K
  Working Set Peak: 1.24M
  Elapsed Process: 641 ms
  Kernel time: 121 ms
  Page Faults: 354
  CPU Time: 632 ms
  GDI Objects: 0

With patch:

Scenario 'org.eclipse.jdt.ui.tests.performance.views.TypeHierarchyPerfTest#testOpenObjectHierarchy()' (average over 1 samples):
  Used Java Heap: -697552
  Working Set: 2.66M
  Committed: 2.43M
  Working Set Peak: 3.07M
  Elapsed Process: 2.06 s
  Kernel time: 391 ms
  Page Faults: 1.18K
  CPU Time: 1.98 s
  GDI Objects: 92

Scenario 'org.eclipse.jdt.ui.tests.performance.views.TypeHierarchyPerfTest#testOpenCollHierarchy()' (average over 1 samples):
  Used Java Heap: 1.56M
  Working Set: 992K
  Committed: 1'004K
  Working Set Peak: 664K
  Elapsed Process: 901 ms
  Kernel time: 100 ms
  Page Faults: 297
  CPU Time: 891 ms
  GDI Objects: 12

Scenario 'org.eclipse.jdt.ui.tests.performance.views.TypeHierarchyPerfTest#testOpenObjectHierarchy2()' (average over 1 samples):
  Used Java Heap: -1693952
  Working Set: 1.26M
  Committed: 3.1M
  Working Set Peak: 1.3M
  Elapsed Process: 871 ms
  Kernel time: 110 ms
  Page Faults: 403
  CPU Time: 871 ms
  GDI Objects: 0