MessageTally not working as expected

[codefrau]

E.g. in a 4.5 image running

MessageTally spyOn: [10 timesRepeat: [(2 raisedTo: 100000000) basicSize]]

gives

100.0% {3441ms} EventSensor>>eventTickler
  100.0% {3441ms} Delay>>wait

Perhaps there is something wrong with process switching?

[codefrau]

Works fine in a Spur image, but 4.5 is still broken.