with a previous version (i don't know exactly the version but it was with bmax 1.24,i think ) of MaxGui (few months ago) which was integrated in brl/pub mod, the canvas of my window was increased instantaneously without black blank area in the extended zone.
So are you saying that you are experiencing the same lag both in the new Windows MaxGUI driver (MaxGUI.Win32MaxGUIEx) and the legacy Windows MaxGUI driver (MaxGUI.Win32MaxGUI), i.e. this problem isn't specific to the new module? If this is the case, I could really do with knowing the exact version of the old Windows module that resized appropriately, and the version at which it slowed down. My original understanding that this was *only* evident in the new MaxGUI.Win32MaxGUIEx module...
But now the latest version of MaxGui (maxgui.ex) from subversion, the refresh of the canvas is slower and not good.
I have a tonne of exams approaching in a few weeks so my very limited free coding time is completely wiped out now that I'm revising. As such, I don't have time to download and test each MaxGUI release myself (and even if I did, I don't have your problematic source code). As such, if you want me to look into this, I'll need some help.