[Webkit-unassigned] [Bug 227938] New: Loading cache assets very slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227938

            Bug ID: 227938
           Summary: Loading cache assets very slow
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: thibaut at smplrspace.com

Steps to reproduce:

Visit https://smplr.me/BLZQAAx. On first load, the 3D assets take a few seconds to load which is normal. The bouncing spheres represent the loading state. Then refresh, the assets are cached and should load much faster.

Actual results:

The cached assets (I’ve confirmed they are cached from the network tab in the devtools, after a reload) are slow to load. The bouncing sphere are displayed for a few seconds (sometimes over 10s) even after they are displayed as loaded (cached in this instance) in the network tab.

To make things more complicated, this happens only with Safari and Firefox Developer Edition, but not with Firefox, Chrome, Chrome Dev, Edge, or Edge Dev. The experience is consistent with all browsers.

Expected results:

I'm expecting the cached assets to load quickly as with other browsers. I’ve tried to record a profile with Firefox Dev Edition (not familiar with Safari's profiler) during the load but I’m not seeing anything that explains why everything is loading for so long, see my recorded profile at https://share.firefox.dev/2TUz1fs if that helps.

I reported this on the FF side as well: https://bugzilla.mozilla.org/show_bug.cgi?id=1720259

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.webkit.org/pipermail/webkit-unassigned/attachments/20210714/6e82ec81/attachment.htm>