Marcel Taeumel uploaded a new version of Chronology-Core to project Squeak 6.0:
http://source.squeak.org/squeak60/Chronology-Core-mt.81.mcz

==================== Summary ====================

Name: Chronology-Core-mt.81
Author: mt
Time: 22 February 2023, 11:27:44.882528 am
UUID: e4a5b396-8917-7f46-a6c7-a6961ff588af
Ancestors: Chronology-Core-ct.80

Fixes #highResClock usage by resetting the estimated #highResClockTicksPerMillisecond on system start-up. The preference #useHighResClockForTiming works now as well.

=============== Diff against Chronology-Core-ct.80 ===============

Item was changed:
  ----- Method: Time class>>startUp: (in category 'system startup') -----
  startUp: resuming
  
  	resuming ifTrue: [
+ 		LastClockTick := 0.
+ 		HighResClockTicksPerMillisecond := 0 ]!
- 		LastClockTick := 0 ]!

Item was added:
+ ----- Method: Time class>>useHighResClockForTiming: (in category 'preferences') -----
+ useHighResClockForTiming: booleanOrNil
+ 
+ 	UseHighResClockForTiming := booleanOrNil.!