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Yes, I had a variable there somewhere called len and then I changed its name but it was still in what you call the global scope I guess as I repasted the codes from the Worksheet and then len([1,2,3]) was 3 again. Didn't know I couldn't call the function len then, a name that should be avoided is not so object-oriented!

I can understand DSM has touched the root of the problem, with the ceil(log(4,2))
Still: 2.5 seconds average cputime on a 2GHz CPU is an exceptionally long time lag! It happened every time I tried but under very specific circumstances as described above. Oh, and the myfunction(num) was called from the textfield below.

Sage 4.7.2 in Windows, I hope this helps. Thank you!

Yes, I had a variable there somewhere called len and then I changed its name but it was still in what you call the global scope I guess as I repasted the codes from the Worksheet and then len([1,2,3]) len([1,2,3]) was 3 again. Didn't know I couldn't call the function len then, a name that should be avoided is not so object-oriented!

I can understand DSM has touched the root of the problem, with the ceil(log(4,2))
Still: 2.5 seconds average cputime on a 2GHz CPU is an exceptionally long time lag! It happened every time I tried but under very specific circumstances as described above. Oh, and the myfunction(num) was called from the textfield below.

Sage 4.7.2 in Windows, I hope this helps. Thank you!