This is a `perf report` from just 3-4s around reactivating a unity8 vt:

  18,33%  Mir/Input Reade  libc-2.24.so             [.] malloc
   5,42%  unity8           libQt5Core.so.5.7.1      [.] 
_ZL28qMetaTypeCustomType_unlockedPKciPi.constprop.817
   4,55%  MirServerThread  libglib-2.0.so.0.5105.0  [.] g_main_context_dispatch
   3,44%  unity8           libQt5Qml.so.5.7.1       [.] 
_ZN3QV413InternalClass4findEPKNS_6StringE
   2,34%  unity8           libQt5Qml.so.5.7.1       [.] 
_ZNK3QV414QObjectWrapper12findPropertyEPNS_15ExecutionEngineEP15QQmlContextDataPNS_6StringENS0_12RevisionModeEP16QQmlPropertyData
   2,31%  unity8           libQt5Qml.so.5.7.1       [.] 
_ZN3QV413MemoryManager9allocDataEmm
   1,83%  unity8           libc-2.24.so             [.] _int_free
   1,56%  unity8           libQt5Qml.so.5.7.1       [.] 
_ZN11QQmlBinding6updateE6QFlagsIN19QQmlPropertyPrivate9WriteFlagEE

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https://bugs.launchpad.net/bugs/1675357

Title:
  Unity8 spins for a long time after being on an inactive vt

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