1318578 - browser slow, may be browser's pdf.js

Status: RESOLVED INCOMPLETE

(Firefox :: PDF Viewer, defect)

Description

[Jim Michaels]

User Agent: Mozilla/5.0 (Windows NT 5.1; rv:50.0) Gecko/20100101 Firefox/50.0
Build ID: 20161104212021

Steps to reproduce:

upgraded to 50.0


Actual results:

have 75 tabs, about 10 of which are pdf's. 
that usually slows down any browser (foxit makes such a binary pdf reader and I think they sell a library, as a suggestion).
seriously? ps+pdf interpreter on js? or is this just an API wrapper?
my browser is really slowing down the machine. could 


Expected results:

ps interpreters for pdf and pdf stuff should be implemented in c/c++ as a plugin I should think. extension?

Comment 1

[Cosmin Muntean [:cmuntean], Ecosystem QA]

User Agent  Mozilla/5.0 (Windows NT 5.2; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
Firefox 50.0, Build ID  20161104212021

Hi Jim, I have tested this issues on latest Firefox (50.0) release. I have opened 65 tabs with random websites and 10 tabs with pdf's and compared the performance with another profile where I have opened 75 tabs with random website. The memory used for both tests was between 2.5 - 2.8GB. But I have observe that when scrolling on a pdf, the CPU usage is about between 15-30% and on a random page 5-20%.

However, I am assigning a component to this issue in order to involve the development team and get an opinion on this.

Comment 2

[Wayne Mery (:wsmwk)]

Jim, do you still see this issue when using a current version?