[Webkit-unassigned] [Bug 247782] New: Very slow renderng of large files

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247782

            Bug ID: 247782
           Summary: Very slow renderng of large files
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: vprelovac at gmail.com
                CC: beidson at apple.com

Loading this URL

https://raw.githubusercontent.com/json-iterator/test-data/master/large-file.json

Takes unnecessary long time. 

On my system it takes about 2 seconds to load the file, and 28 seconds to render it in DOM, which is unexpected given it is a text file.

Firefox does the same in about 12 seconds, which is still inefficient but still 2.5x faster.

Even stranger, loading the file with pure JavaScript:

fetch('https://raw.githubusercontent.com/json-iterator/test-data/master/large-file.json')
  .then((response) => response.text())
  .then((data) => document.write("<pre>"+data+"</pre>");

Takes only 2 seconds, or 15 times faster than native browser loading!

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