Desktop GUI loading slow

Question

I am developing desktop based GUI (single form) using wxPython and loads it using remote citrix access from client private network.

Suppose, the GUI has certain group of select and text boxes which are loaded together when application starts. The value of select boxes come from database and on the basis of selection of select box value, corresponding text boxes (which are initially blank) are populated from database.

Now the problem is, due to slow remote access, we have to wait for long time (approximately 5-7 minutes ) before all controls are loaded. Is there any suggestion, if we can reduce this time ?

One way coming in first thought is to divide the GUI in multiple tabs and divide the controls among tabs. This way I need to load less controls when application starts for showing first tab. Other controls load, only after user click corresponding tab.

Any other way or this one is the best approach?