really slow rendering in browser

[tfmorris]

Original author: libo...@gmail.com (June 11, 2012 12:24:49)

What steps will reproduce the problem?

1. Load attached xml data (same as in issue XML import merges records together #137).
2. Even the initial display is really slow.
3. Click 'next>>' in the pager.

What is the expected output? What do you see instead?
It takes about 25 seconds on 4 GB Xeon E31245 to render 10 records (about 80 rows). A second or two for rendering would be acceptable. See attached screenshot.

What version of Google Refine are you using?
Tried with 2.5 and SVN trunk checkout.

What operating system and browser are you using?
Win7, Chrome 19 and Opera 11, both browsers go haywire.

In issue #137 @tfmorris noticed that this could be caused by large number of null cells. Can someone verify this?

Original issue: http://code.google.com/p/google-refine/issues/detail?id=583

[tfmorris]

From libo...@gmail.com on June 11, 2012 12:41:10:
Excuse the typo - it takes 15 seconds on the screenshot, but I noticed also times around 30 seconds in similar cases - probably dependent on the real number of rows in each record.

[tfmorris]

From tfmorris on September 08, 2012 02:58:29:
I've tracked this down to the column width resizing code in data-table-view.js. DataTableView._adjustDataTables() is causing an enormous amount of time to be spent in jQuery's cssHooks.get() method, but I'm not sure what the fix is yet.

Quitting for now, so recording for posterity...

[ettorerizza]

XML rendering in the browser is still very, very, very slow, even with an xml of a very average size and complexity. I only go through sites like this one to try to get a CSV that will then import into Open Refine.

(Open Refine 2.7, Windows 10, Chrome)

File used for the screencast is in attachment.

desc_en.zip

[thadguidry]

@ettorerizza Yeah, we know... Jackson library does fine for parsing it out... the problem is the Record row rendering is slow. I'll mark this has higher priority to look into and fix eventually. Thanks Ettore !