[browser][HybridGlobalization][tracking] Regressions of text APIs when running in *HybridGlobalization* mode.

[matouskozak]

Based on our investigations, some of the String, TextInfo and CompareInfo APIs are running slower with WASM HybridGlobalization (HG) enabled than with HG disabled.

Here is the summary of the largest regressions. We compare the default behavior (using ICU4C) to the scenario with enabled HG (both running with interpreter, similar numbers are reported for AOT as well).

API	time ICU4C [ms]	time HG [ms]	slow-down
String, TextInfo ToLower	0.2698	90.9531	33611%
String, TextInfo ToUpper	0.2545	90.9077	35620%
String, TextInfo ToTitleCase	7.1761	113.7647	1485%
String, String Compare	0.0397	0.374	842%
String, String Equals	0.0397	0.3717	836%
String, CompareInfo Compare	0.0393	0.373	849%
String, String IndexOf	4.7239	2362.6667	49915%
String, String LastIndexOf	8.1408	2361	28902%

Note: These regressions only influence application where HG is enabled (e.g., by adding <HybridGlobalization>true</HybridGlobalization> to the .csproj file) as it is not the default settings.

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Tracking list of APIs waiting to be optimize:

• ToLower
• ToUpper
• ToTitleCase
• Compare
• Equals
• IndexOf: reduced down to 38ms by [browser][HybridGlobalization] Improve speed performance of IndexOf and LastIndexOf text APIs with HybridGlobalization mode #95583
• LastIndexOf: reduced down to 38ms by [browser][HybridGlobalization] Improve speed performance of IndexOf and LastIndexOf text APIs with HybridGlobalization mode #95583

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cc: @ilonatommy @mkhamoyan @SamMonoRT

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Issue Details

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Based on our investigations, some of the String, TextInfo and CompareInfo APIs are running slower with WASM HybridGlobalization (HG) enabled than with HG disabled.

Here is the summary of the largest regressions. We compare the default behavior (using ICU4C) to scenario with enabled HG (both running with interpreter).

API	time ICU4C [ms]	time HG [ms]	slow-down
String, TextInfo ToLower	0.2698	90.9531	33611%
String, TextInfo ToUpper	0.2545	90.9077	35620%
String, TextInfo ToTitleCase	7.1761	113.7647	1485%
String, String Compare	0.0397	0.374	842%
String, String Equals	0.0397	0.3717	836%
String, CompareInfo Compare	0.0393	0.373	849%
String, String IndexOf	4.7239	2362.6667	49915%
String, String LastIndexOf	8.1408	2361	28902%

Similar numbers are reported for AOT as well.

Note: These regressions only influence application where HG is enabled (e.g., by adding <HybridGlobalization>true</HybridGlobalization> to the .csproj file) as it is not the default settings.

---

Tracking list of APIs waiting to be optimize:

• ToLower
• ToUpper
• ToTitleCase
• Compare
• Equals
• IndexOf
• LastIndexOf

---

cc: @ilonatommy @mkhamoyan @SamMonoRT

Author:	matouskozak
Assignees:	-
Labels:	arch-wasm, area-System.Globalization
Milestone:	-

[matouskozak]

Moving to .net 10 as it is not blocking a release. Hybrid globalization on browser is an optional feature. cc: @ilonatommy

[matouskozak]

Closing as not planned, more info #110526