I just did a quick benchmark:

| model |
model := ObjectExplorer new.
[(ToolBuilder open: model) delete] bench.

And could not measure any difference for both implementations. Seems that
opening and closing windows is much more resource intensive than creating
and initializing the GUI structures.

Even worse: My mental model for a tool builder actually was that it is
*empty* when working with it in #buildWith: code.

Best,
Marcel



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