I see some major slowness in the latest releases…progressively worse after 2017.
Clicking from a folder to a window and back to the folder(after the window editor appears) in the IDE… the window has about 280 controls (labels, textfields, canvases on several pagepanels) takes about:
2017r3: 4 seconds
2018r4: 15 seconds
2019r1.1: 15 seconds
2019r2.1: 24 seconds
2019r3: 24 seconds
Try opening your project in 2017r3 and see if it’s more responsive.