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...licking the "slow" buttons just calls timings directly, and takes several seconds to run. However, if we request input from the console, via readline (the "fast" button) then the timing drops back down to hundredths of a second. library(tcltk) win <- tktoplevel() btn1 <- ttkbutton(win, text = "slow", command = function() timings()) btn2 <- ttkbutton(win, text = "fast", command = function() {readline("Press ENTER > "); timings()}) tkpack(btn1, btn2) I've only observed this slow behaviour with RGui on Windows (XP) - it doesn't happe...

...med widget set has much to recommend it, and it certainly looks much better on MacOS and Windows. I've added bindings to package tcltk for R-devel, and taken a quick look at what would be needed to convert package Rcmdr to make use of them. in many uses they are a drop-in replacement (e.g. ttkbutton for tkbutton), but some of the customizations (fg="red") have different names (foreground="red", which also works for tkbutton) and others are replaced by the theme. -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.s...