Until you look at memory consumption in Task Manager or Process Explorer. WebView2 spawns ~400Mb worth of various browser processes. Your main app process by itself might look nice and slim, but all that (somewhat hidden) cost is atrocious.

Microsoft Schedule+ was Microsoft's workgroup calendaring app before the Office division merged email and calendar into one app.

Outlook was late so Schedule+ was included in Office 95 for the Win95 release and so Schedule+ got a wider retail consumer release than if it had been just included with the Microsoft Exchange Server 4.0 release.

from https://www.reddit.com/r/software/comments/v73bk7/microsoft_...

  I've been using Schedule+ 95 to keep track of my daily activities since forever. I even modified my Windows install to keep it fully compatible after WinHlp32 was nixed in Windows 10. However, it is increasingly showing its age, and there are certain aspects where I would prefer a more modern solution; I can't integrate Sched+ with my smart phone easily ...

  I'm explicitly NOT looking for any cloud or web apps. I don't have reliable internet nor are all of my daily use machines fast enough to reliably, and responsively, display 90% of the bloated webapps out there. I want something lean, fast, and native for the desktop. Schedule+ uses a max of about 7MB of RAM and I don't want to go over 10-20.