I have started porting my Qt3 app to Qt4. This of course means that I need to spend time in designer cleaning up the mess that is created when the forms are converted. (Why does this make horizontal spacers vertical? And why doesn't it just keep the same size policy settings as the Qt3 form?) I am finding Qt designer to be VERY SLOW on my system. On complex dialogs it can take 30 seconds just to select a widget and it uses huge amounts of CPU while this is happening. This can't be right and there must be something wrong with how this is configured or some other issue. Designer is so slow that it is painful to work with and this is having a significant impact on my productivity and is delaying the porting work that I need to do. Anyone here have any ideas about how to fix this?