8
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StringTemplate introduced in version 10 is very convenient in constructing formatted data. However, it seems to have a huge performance issue.

Consider this example:

data = RandomInteger[{1, 100}, {20000, 3}];

data1 = 
   StringRiffle[
    Apply[StringTemplate["<`1`,`2`,`3`>,`1`,`2`,`3`"], data, {1}], 
    ",\n"]; // AbsoluteTiming
(* {6.54397, Null} *)

data2 = 
   StringRiffle[
    Apply["<" <> ToString[#1] <> "," <> ToString[#2] <> "," <> 
       ToString[#3] <> ">" <> "," <> ToString[#1] <> "," <> 
       ToString[#2] <> "," <> ToString[#3] &, data, {1}], 
    ",\n"]; // AbsoluteTiming
(* {0.186368, Null} *)

data1 == data2
(* True *)

We see that although the StringTemplate version is short and clean, it is 35X slower than the ordinary StringJoin version.

Do you consider this a bug?

Improve this question
$\endgroup$
4
  • $\begingroup$ I would consider it worth reporting. $\endgroup$
    – chuy
    Aug 30, 2016 at 13:32
  • 1
    $\begingroup$ FYI: reported with [CASE:3699358]. $\endgroup$
    – xslittlegrass
    Aug 30, 2016 at 13:45
  • $\begingroup$ Have you received any reply from the support? $\endgroup$
    – Alexey Popkov
    Mar 19, 2017 at 12:42
  • $\begingroup$ No body use StringTemplate? Why no one cares about the performance? The performance issue still remains to date with 12.2 ! $\endgroup$
    – matheorem
    Jul 5, 2022 at 14:58

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