1726990 - wasm is 4x slower after page reload

Status: RESOLVED DUPLICATE of bug 1719615

(Core :: JavaScript: WebAssembly, defect)

Description

[Serhat]

Attachment: .wasm file with html, js, source, screenshots

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0

Steps to reproduce:

• serve 'web' directory with a simple web server on port 8090
• open Firefox 91.0.1
• open developer tools
• visit http://localhost:8090
• click Run button
• wait for button to enable
• click Run again (observe output in console: firefox.jpg)
• reload the page
• click Run button
• wait for button to enable
• click Run again (observe output in console: firefoxReload.jpg)

Note: my setup is Manjaro Linux, core i5 cpu. main.go compiled with Go 1.16.7

Actual results:

After reload, wasm code (a sorting test) runs 4x slower.

Expected results:

Same running time is expected after reload. See chromium.jpg and chromiumReload.jpg for the same experiment on Chromium 92.0.4515.159

Comment 1

[Serhat]

Attachment: my simple web server in Go

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Javascript: WebAssembly' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 3

[Serhat]

Attachment: test with tinygo compiler

with tinygo compiler v0.19.0, it is 5.5x slower after a reload.