User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0 Build ID: 20170905100117 Steps to reproduce: Try to upload large file (> 300MB) to mediafire.com I have attached video for comparison, first part is using Microsoft Edge and second part is using Firefox Nightly Latest Build Actual results: File Analyzing Step Is Very Slow! Take many times longer than expected. (compared to Microsoft Edge, Google Chrome and Firefox version 55 and below) Expected results: File Analyzing Step Should Be Fast! (As I have attached comparison video)
[Tracking Requested - why for this release]: Regression
Has Regression Range: --- → no
Has STR: --- → yes
status-firefox55: --- → unaffected
status-firefox56: --- → ?
status-firefox57: --- → affected
status-firefox-esr52: --- → unaffected
tracking-firefox57: --- → ?
Keywords: regression, regressionwindow-wanted
OS: Unspecified → Windows 10
Hardware: Unspecified → x86_64
Status: UNCONFIRMED → RESOLVED
Last Resolved: a year ago
tracking-firefox57: ? → ---
Resolution: --- → DUPLICATE
Duplicate of bug: 1397645
Mirror the status of bug 1397645.
Component: Untriaged → DOM
Product: Firefox → Core
Target Milestone: --- → mozilla57
You need to log in before you can comment on or make changes to this bug.