windows GUI

Hello thar /prog/
A story and question for you.

A while back I used to work in a company where we had a client program they would rent out on touch tablets the company owned to customers.  It would full-screen and then, on command, make various calls to either a MySQL server or another specialized server using JSON.  It was programmed in VB.NET and I noticed that as the program had more windows forms added to it, and more code, the program itself began to act slow.  Form elements began to take a few seconds to fully print on the screen, and switching between full-screened forms led to the taskbar showing over the program's face.  Needless to say, this was very unprofessional looking.

TL;DR VB.NET is lame

Now I'm looking for an alternative programing language that can easily employ the windows GUI.  I was thinking of trying out Python.  What do you think /prog/?

Frankly, if you want a responsive GUI you'll just have to write your own drawing routines.  Libraries work fine for one or two forms, but for larger programs they start bogging down, as you've seen yourself, and this is even worse in windows.
I recommend you use a responsive language like ASM or Pascal.  C/C++ is fast enough for longer computations, but there's too much delay to be suitable for real-time GUIs.