Bug 204799 - Network Load metrics are wrong / stale when resources are loaded from the memory cache
Summary: Network Load metrics are wrong / stale when resources are loaded from the mem...
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Web Inspector (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2019-12-03 10:20 PST by Chris Dumez
Modified: 2020-01-06 12:16 PST (History)
3 users (show)

See Also:

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Chris Dumez 2019-12-03 10:20:45 PST 
Network load metrics are populated by CFNetwork in the network process. If you navigate back to a page without using the back/forward cache, a lot of the resources will come from the memory cache and Web Inspector will report confusing values for those loads (especially "Response Download").

On nytimes.com, when navigating back from an article to the main page, Web Inspector was telling me that the resource came from the memory cache (GOOD) but took 800ms to download (WRONG).
Comment 1 Radar WebKit Bug Importer 2020-01-06 12:16:31 PST 
<rdar://problem/58350101>