Performance and Table

Hi,
I am developing new application based on GTK+. Application contains 
GtkNotebook with several tabs. One tab is huge form which contains ca. 
70 "GtkEntry"s and 70 "GtkLabel"s. All widget are placed in GtkTable. 
Switching to this tab is terribly slow in Win32, resp. when I switch to 
this tab I can see redrawing of every single widget (on P4, 2GHz). 
Redrawing in Linux is much more faster.

Is it possible to somehow improve speed of redrawing ?
I've thought that GTK+ is using double buffering so redrawing shouldn't 
be visible ?

Thanks for any help.

Regars,
Petr Pytelka