Submodule hustle.

init/FiraCode/docs/calt_performance.md

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+# Time to shape text with different calt code
+
+Baseline:
+
+```
+sub 1 2 3 4 by 1_2_3_4.liga;
+```
+
+Spacers:
+
+```
+sub 1.spacer 2.spacer 3.spacer 4' by 1_2_3_4.liga;
+sub 1.spacer 2.spacer 3'       4  by 3.spacer;
+sub 1.spacer 2'       3        4  by 2.spacer;
+sub 1'       2        3        4  by 1.spacer;
+```
+
+Lookups:
+
+```
+lookup 1_2_3_4 {
+  sub 1.spacer 2.spacer 3.spacer 4' by 1_2_3_4.liga;
+  sub 1.spacer 2.spacer 3'       4  by 3.spacer;
+  sub 1.spacer 2'       3        4  by 2.spacer;
+  sub 1'       2        3        4  by 1.spacer;
+} 1_2_3_4;
+```
+
+Ignores:
+
+```
+lookup 1_2_3_4 {
+  ignore sub 1 1' 2 3 4;
+  ignore sub 1' 2 3 4 4;
+  sub 1.spacer 2.spacer 3.spacer 4' by 1_2_3_4.liga;
+  sub 1.spacer 2.spacer 3'       4  by 3.spacer;
+  sub 1.spacer 2'       3        4  by 2.spacer;
+  sub 1'       2        3        4  by 1.spacer;
+} 1_2_3_4;
+```
+
+Benchmark:
+
+```
+time hb-shape -n 100000 distr/ttf/FiraCode-Regular.ttf "Hello +++ /// !== <-> world"
+```
+
+Setup:
+
+```
+HarfBuzz 2.6.4
+3,2 GHz 6-Core Intel Core i7
+MacOS 10.15.3
+```
+
+Results:
+
+```
+Baseline 0.407s
+Spacers  1.415s
+Lookups  2.080s
+Ignores  2.656s
+```