Benchmark: Writing to objects - Seal vs Unsealed

HTML Preparation code:

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

Script Preparation code:

function new_struct() {
   return {
		a : Math.random(),
        b : Math.random(),
        c : Math.random(),
        d : Math.random(),
   };
}

var structs1   = new Array(10000);
var structs2   = new Array(10000);

var new_values = new Array(10000)

for (let i = 0; i < 10000; i++) {
    structs1[i]   = new_struct();
    structs2[i]   = Object.seal(Object.assign(new_struct(), structs1[i]));
    new_values[i] = new_struct();
}

Tests:

Sealed
for (let i = 0; i < structs1.length; i++) { structs1[i].a = new_values[i].a; structs1[i].b = new_values[i].b; structs1[i].c = new_values[i].c; structs1[i].d = new_values[i].d; }
Unsealed
for (let i = 0; i < structs2.length; i++) { structs2[i].a = new_values[i].a; structs2[i].b = new_values[i].b; structs2[i].c = new_values[i].c; structs2[i].d = new_values[i].d; }

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Firefox 5 runs

Unsealed

20K/s

Sealed

19K/s

View exact numbers

✓ Unsealed: 20,263 ops/sec
• Sealed: 19,315 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Sealed
Unsealed

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0

Browser/OS: Firefox 142 on Linux

View result in a separate tab

Unsealed

20K/s

Sealed

17K/s

View exact numbers

Test name	Executions per second
✓ Unsealed	20,263 Ops/sec
Sealed	17,185 Ops/sec

Writing to objects - Seal vs Unsealed (version: 3)

Comparing performance of: `Sealed vs Unsealed`

Created: one year ago by: Registered User

Go to the latest result

Sealed

Unsealed

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Firefox 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Writing to objects - Seal vs Unsealed (version: 3)

Comparing performance of: Sealed vs Unsealed

Created: one year ago by: Registered User

Go to the latest result

Sealed

Unsealed

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Firefox 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `Sealed vs Unsealed`