I noticed since Mathematica v12 a very slow frontend when rendering the Units.

Easy to show:

Quantity[Range[1, 100], "Euros"]

Takes (timed with a stopwatch) approx. 17 seconds.. Is it my computer?

Quantity[Range[1, 100], "Euros"];

has immediate result. When using FinancialData it's almost impossible to show the results in the Notebook.

Any thoughts appreciated

  • $\begingroup$ If you don't care about tooltips etc: TextString /@ Quantity[Range[100], "Euros"] $\endgroup$
    – Kuba
    Jul 8, 2019 at 12:44
  • $\begingroup$ Quantity[Range[1, 100], "Euros"] takes less than 2 sec on my MacBook Pro (3 GHz Intel Core i7) with macOS 10.14.5 $\endgroup$
    – Bob Hanlon
    Jul 8, 2019 at 13:02
  • $\begingroup$ 8 seconds in Mma12, Windows 7Pro, i7-4770 3.4GHz 16Gb RAM, I have noticed the problem before. I agree that this is slow. $\endgroup$
    – rhermans
    Jul 8, 2019 at 13:19
  • $\begingroup$ I use a Windows 10 with a [email protected] 16GB RAM. I find it unworkable slow... sigh.. $\endgroup$
    – Lou
    Jul 8, 2019 at 13:35
  • $\begingroup$ I logged a support Call. Anyway I also note that when I minimize the Notebook and then open the window again, the notebook is black. Then after some seconds it comes back again. Since @BobHanlon MAC is "only" 2 seconds .. could it be a windows related issue? $\endgroup$
    – Lou
    Jul 8, 2019 at 13:46

1 Answer 1


I logged a call and it's a known issue. Will be fixed in a upcoming next release of Mathematica. Pinky Swear.

Update: presumably version 12.1

Just tested this again and with Mathematica 12.1 it's now taking 0.0000891091950117 seconds on the same computer.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.