tcl/tk behaves very slowly for fast calls, such as when dragging an array of considerable size, or a big group of objects? afaik this is something that could be improved in the present platform, but how better could it be when using another gui framework?

It might be a good idea to list the problems with tcl/tk so we can weigh them against the difficulty of using a different GUI toolkit. The problems I see are:
* difficult to implement a decent zoom function for a canvas
* can't display png without the Img library (included in 8.6)

* can't do alpha transparency


Of the three I listed, I'm mostly interested in the first as it means that (without prior planning) it's hard to take a patch you've been working on at font size 10 and display it adequately over a projector, for example. (If there's a work around I'd like to know it.) I'd like to hear others, but I'm mostly interested in problems with tcl/tk >= 8.5 as the GUI.

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