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Web Clipper extension is causing at least readthedocs.io to load very slowly on Chrome



With the web clipper extension enabled, pages from the Boto3 website can take a very long time to load.

For example, this page takes close to 2 minutes on a corporate network: http://boto3.readthedocs.io/en/latest/reference/services/dynamodb.html

The offending request is:

Request URL:https://readthedocs.org/api/v2/footer_html/?callback=jQuery20305196791010642672_1526398462898&project=boto3&version=latest&page=reference%2Fservices%2Fdynamodb&theme=guzzle_sphinx_theme&format=jsonp&docroot=%2Fdocs%2Fsource%2F&source_suffix=.rst&_=1526398462899
Request Method:GET
Status Code:200 OK
Remote Address:
Referrer Policy:no-referrer-when-downgrade

I narrowed it down by first disabling all extensions and then enabling extensions one at a time until I found Web Clipper to be the problem.

All pages on this site are impacted, but the degree appears to correspond with the size of the page.

I really haven't a clue what the other site is doing...I imagine a lot of changes to the DOM that result in some rescan of the page by Web Clipper.

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