Use fetchpriority=high for dynamically loaded scripts#2194
Open
bschwarzent wants to merge 1 commit into
Open
Conversation
Modern browsers assign each request a priority. Scripts that are loaded dynamically by injecting an additional <script> tag into the DOM are assigned a low priority by default [1]. Under certain conditions, this will introduce significant but unnecessary delays (> 15s). This is problematic if the caller waits for the script completion. Since request priorities are primarily relevant during the initial rendering of a HTML page, we can safely increase the priority hint for all scripts that are dynamically injected later using the central method $.injectScript() by setting the "fetchpriority" attribute [2] to "high". [1] https://web.dev/articles/fetch-priority [2] https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes/fetchpriority 462323
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Modern browsers assign each request a priority. Scripts that are loaded dynamically by injecting an additional <script> tag into the DOM are assigned a low priority by default [1]. Under certain conditions, this will introduce significant but unnecessary delays (> 15s). This is problematic if the caller waits for the script completion.
Since request priorities are primarily relevant during the initial rendering of a HTML page, we can safely increase the priority hint for all scripts that are dynamically injected later using the central method $.injectScript() by setting the "fetchpriority" attribute [2] to "high".
[1] https://web.dev/articles/fetch-priority
[2] https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes/fetchpriority
462323