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Yes the fix to bug 1007897 will help all web content. That profile will show calls from JS and how theycall into native C++ calls. This is very useful for prof

by bgirard 12y ago

Yes the fix to bug 1007897 will help all web content. That profile will show calls from JS and how theycall into native C++ calls. This is very useful for profiling things like canvas. PDF.js isn't bottlenecked by javascript performance, like many well tuned apps out there, so there's a lot of improvements that can be made by tweaking the web platform.

acqq 12y ago
Wonderful! You diagnose so fast it looks like magic! Do you see anything new when profiling this one: http://www.engageny.org/sites/default/files/resource/attachments/math-g5-m4-lessons-1-12.pdf http://www.engageny.org/sites/default/files/resource/attachm... and http://www.math.mtu.edu/~msgocken/pdebook2/mapletut2.pdf http://www.math.mtu.edu/~msgocken/pdebook2/mapletut2.pdf
- bgirard 12y ago
  http://people.mozilla.org/~bgirard/cleopatra/#report=a848ab9fd51748cfe7a6a5470daa96e2f26a49c6 http://people.mozilla.org/~bgirard/cleopatra/#report=a848ab9... The first PDF.js document uses the DOM instead of Canvas like the previous one. This is done to support text selection. Most of the time is spent in the style system. I don't know that area very well but in the past I've seen simplifying CSS selectors make all the difference. I know a fairly important problem for B2G is spending up expensive style flush (https://bugzilla.mozilla.org/show_bug.cgi?id=931668 https://bugzilla.mozilla.org/show_bug.cgi?id=931668) but I don't know enough about CSS to know if that fix will solve the problem here.
slacka 12y ago
Does your profile explain why large PDFs are so laggy when scrolling in PDF.js? For example take http://www.math.mtu.edu/~msgocken/pdebook2/mapletut2.pdf http://www.math.mtu.edu/~msgocken/pdebook2/mapletut2.pdf open it in FF and hold the page down or up. On my laptop, that will lockup FF. Yet, if I open it in Acrobat Reader or Chrome, I can scroll up and down much faster without the jerky behavior. It is even possible a JavaScript app in FF to get the kind of performance Google gets with their pdf plugin? With the power of today's PC's, it seems like something is seriously wrong with "web technology" if my machine struggles to render pdf documents.

by bgirard 12y ago

acqq 12y ago

Wonderful! You diagnose so fast it looks like magic! Do you see anything new when profiling this one: http://www.engageny.org/sites/default/files/resource/attachments/math-g5-m4-lessons-1-12.pdf http://www.engageny.org/sites/default/files/resource/attachm... and http://www.math.mtu.edu/~msgocken/pdebook2/mapletut2.pdf http://www.math.mtu.edu/~msgocken/pdebook2/mapletut2.pdf

bgirard 12y ago
http://people.mozilla.org/~bgirard/cleopatra/#report=a848ab9fd51748cfe7a6a5470daa96e2f26a49c6 http://people.mozilla.org/~bgirard/cleopatra/#report=a848ab9... The first PDF.js document uses the DOM instead of Canvas like the previous one. This is done to support text selection. Most of the time is spent in the style system. I don't know that area very well but in the past I've seen simplifying CSS selectors make all the difference. I know a fairly important problem for B2G is spending up expensive style flush (https://bugzilla.mozilla.org/show_bug.cgi?id=931668 https://bugzilla.mozilla.org/show_bug.cgi?id=931668) but I don't know enough about CSS to know if that fix will solve the problem here.

slacka 12y ago

Does your profile explain why large PDFs are so laggy when scrolling in PDF.js? For example take http://www.math.mtu.edu/~msgocken/pdebook2/mapletut2.pdf http://www.math.mtu.edu/~msgocken/pdebook2/mapletut2.pdf open it in FF and hold the page down or up. On my laptop, that will lockup FF. Yet, if I open it in Acrobat Reader or Chrome, I can scroll up and down much faster without the jerky behavior. It is even possible a JavaScript app in FF to get the kind of performance Google gets with their pdf plugin? With the power of today's PC's, it seems like something is seriously wrong with "web technology" if my machine struggles to render pdf documents.