Run results for: UTF-8 vs UTF-16 WASM String Interface

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0

Browser: Firefox 136

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

str_en

6.6M/s

str_ar

2.5M/s

str_en_large

1.4M/s

str_ar_large

516K/s

View exact numbers

Test name	Executions per second
✓ str_en	6,557,358 Ops/sec
str_ar	2,509,458 Ops/sec
str_en_large	1,376,575 Ops/sec
str_ar_large	516,038 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

const str_en = "Comparing the performance of UTF-8 vs UTF-16 string encoding copying into and out of WASM. 🙂";
const str_ar = "استعار جحا مرة آنية من جاره وعندما أعادها له أعاد معها آنية صغيرة";

const str_en_large = str_en.repeat(10);
const str_ar_large = str_ar.repeat(10);

const encoder = new TextEncoder('utf-8');
const decoder = new TextDecoder('utf-8', { ignoreBOM: true, fatal: true });

Tests:

str_en
const buf = encoder.encode(str_en); const str = decoder.decode(buf);
str_ar
const buf = encoder.encode(str_ar); const str = decoder.decode(buf);
str_en_large
const buf = encoder.encode(str_en_large); const str = decoder.decode(buf);
str_ar_large
const buf = encoder.encode(str_ar_large); const str = decoder.decode(buf);