Hi Surrogate,
Windows 10 Pro, Visio 2019 and 2021 on two different PCs and a 3rd Visio 2019 on a coworkers Windows 11 PC. we all have version 2304 (Build 16327.20248). so any time i would scroll in almost to maximum zoom thats it... Visio became unresponsive, PC CPU and memory went through the roof locking up other programs/windows and sometimes would come back after 15-20 seconds and other times had to wait a couple minutes before i could force visio shut. We both had these reg keys : Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\Ecs\visio\ConfigContextData and all we did is change the ConfigContextData to Donotuse ConfigContextData and our issue went away just like that... all systems are 64bit and while all my drawings do contain custom fills and line patterns even opening up a new drawing and zooming in caused the issue.