Question

We did an application using rails(2.3.4), ruby(1.8.2), MySQL, JavaScript, jQuery. This is handling minimum 6000 records. We showing those records detail in table. In the beginning Mozilla taking 2m to load the whole page. We did the cache, eager loading, indexes. Now Mozilla taking 25s to load the whole page. But IE-7 taking 1m30s to load the page.

We don’t know why IE-7 taking too much of time.

1. Any one can help us to detect the running time in IE-7 and tell your guidelines to improve performance in IE-7.
2. Any add-on is available in IE7 to see the AJAX request time taken as like Firebug add on.

Answer 1

From Table Rendering – IE Blog:

When Internet Explorer encounters a table it measures all the content
of the table before rendering so that it knows what the widths of the
columns are to render the content correctly. On the other hand Firefox
uses a different algorithm in that it renders the table contents
progressively before it has all been passed.

You can improve performance by setting the CSS rule table-layout: fixed. The renderer will then calculate the layout based on the first row of the table.