Run results for: JSON vs raw string

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Parsing JSON and mapping to string	2171773.5 Ops/sec
Doing the string addition upstream	149745088.0 Ops/sec

Script Preparation code:

const metadata = {
    FieldA: 'ValueForA',
    PropertyB: 'BasWell',
    AnotherC: 'ParamC',
    AndaD: 'ValueD',
    AlsoE: 'ValueForE'
}

var paramsJson = JSON.stringify(metadata);

var paramsStr = '';
for (const [key, value] of Object.entries(metadata)) {
    paramsStr += `&${key}=${value}`
}

Tests:

Parsing JSON and mapping to string
let src = 'https://baseurl.com/script.js?data=value'; const parsed = JSON.parse(paramsJson) for (const [key, value] of Object.entries(parsed)) { src += `&${key}=${value}` }
Doing the string addition upstream
let src = 'https://baseurl.com/script.js?data=value'; src += paramsStr

Run results for: JSON vs raw string

Parsing JSON and mapping to string

Doing the string addition upstream