UNCONFIRMED Bug 49238
Link prefetch launches subresource requests too aggressively 
https://bugs.webkit.org/show_bug.cgi?id=49238
Summary Link prefetch launches subresource requests too aggressively
Gavin Peters
Reported 2010-11-08 20:35:40 PST
Look at the linked URL, and see the resource loading order. The launch of prefetch requests is occurring too early. Prefetch requests should not be launched while, for instance, the onload is pending. http://code.google.com/p/chromium/issues/detail?id=61476
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Andy Davies
Comment 1 2020-07-23 12:09:09 PDT
This issue still applies in iOS 13.5.1 and Safari 13.1 on mojave It's particularly bad if the HTTP/2 server doesn't support effective prioritisation as Safari makes the requests at a low priority but the server ignores this and responds, potentially blocking higher priority responses. See https://andydavies.me/blog/2020/07/08/rel-equals-prefetch-and-the-importance-of-effective-http-slash-2-prioritisation/
Radar WebKit Bug Importer
Comment 2 2020-07-23 13:36:50 PDT
<rdar://problem/66009869>
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