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I'm experiencing a very weird problem related to executing JS in IE8 on Windows XP being very slow.

We are using YUI 3.9 as our JS library. We load a form with 315 fields.

I used dynaTrace Ajax Edition to identify where is the time being spent. Here's a screenshot of the HotSpots (full size image here):

dynaTrace HotSpots preview

From the screenshot I have identified that the _enhanceFields() function is taking about 13-14 seconds because it is looping through 315 fields and each field is constructed using:

Y.Base.create('fieldName', Y.View , [], { properties }, {});

Has anyone experienced a similar problem? this takes 13-14s only on IE8 + Windows XP. on IE8 + Windows 7 it takes 5s.

Windows XP 32-bit and 7 32-bit are using 4 processors and 2GB of RAM:

enter image description here

Mido
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    Are you perhaps running IE 8 emulated on your Win 7 box? – TGH Oct 24 '13 at 04:49
  • These results are both from identically configured VM's running on the same box (at different times). So we believe we've eliminated different hardware as a cause. – EdC Oct 25 '13 at 00:10
  • I have seen similar behavior: JS execution on IE8 is much slower on XP vs. Windows 7. All other variables held constant - VM images from modern.ie on VirtualBox on same host, with identical VM CPU/RAM config . – wrschneider Aug 04 '15 at 01:45

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