🐛 Frequent polling to`document.cookie` (once a second).

[mstyura]

Describe the bug
The DataDog SDK when used in web application does periodic (once a second) poll of document.cookie. This is ineffective way to detect changes of cookie. At least on mobile Safari it is very expensive in terms of native code executed by WebKit, see #3548 for more details.
The periodic poll is initiated by:

browser-sdk/packages/core/src/domain/session/sessionStore.ts

Line 94 in 5a92f20

const watchSessionTimeoutId = setInterval(watchSession, STORAGE_POLL_DELAY)

To Reproduce
Use DD SDK in a Web application.

Expected behavior
There is no polling of document.cookie for the purpose of change detection.

[rgaignault]

Hi @mstyura,
Thanks for your report ! We’ll look into this and keep you updated

[mstyura]

Thank you very much! I'm working on a web app which loads iPhone almost fully and I literally fighting with each redundant CPU work to not have FPS drops. Having access to expensive document.cookie from DataDog SDK fixed will allow me to keep using it.