MC do not do anything strange with the UI, most of it is standard UI components, and MC do not hook it self into windows and do be able to do strange stuff.
if you run a old Windows like XP there is a limit of the number of UI components that windows can create. And when you reach the end, creating new is really slow. and CAD software are know to use a lot of UI resources.
I know that chrome did something strange a couple of years ago, that cause slow down in creating new tabs, Chrome did something so when Windows was creating new standard UI components is took 10x longer if chrome was openen. But it affected all program, But it was noticed a lot in MC because MC created a lot of those UI components.
Maybe SharkCAD is doing something like that too.
But there is not much MC can do.. MC do not use any "dirty" tricks, or unsupported APIs and stuff that can cause issue.