Bootstrap 2.3.2 responsive design too slow in IE8 - css

Background
I've built a responsive website template. I've chosen to use Bootstrap 2.3.2 because it needs to work in IE7+ and be suitable for mobile devices. I've used respond.js and html5shiv.js so that it will work in IE.
Problem
The site works beautifully in Chrome and Firefox. And it displays well in IE8. However in IE8 it's incredibly slow. Even after the page has finished loading the browser freezes up if I try to scroll down or click on something. It looks great but the slow response time makes it virtually unusable.
Cause of problem
I've identified that Bootstrap.min.css is the cause. When I remove bootstrap.min.css from the page and leave everything else the same, the styles don't work but the page loads quickly and it's very quick to scroll up and down and click on buttons.
I think (or rather I hope!) that the cause is not Bootstrap but rather because I'm using the responsive elements of Bootstrap (e.g. row-fluid). I'd like to keep the site responsive for all non-IE users, but I'd like to try making all widths fixed for IE8 users and below.
Attempts to fix
I've tried overriding the percentage widths in IE by creating a conditional IE stylesheet. However it doesn't appear to be possible to override the media queries, even using !important (example below).
HTML
<div class="row-fluid">
<div class="span10 width7">
</div>
</div>
Bootstrap
This is an example of what I've been trying to override.
#media (min-width: 1200px)
.row-fluid .span10 {
width: 40.92827004219409%;
}
CSS to override Bootstrap
The code below is not able to override the bootstrap css above.
.row-fluid .span10.width7{
width: 485px !important;
}
Question
Has anyone got any suggestions about how I might adapt my template so that it continues to be responsive for non-IE users but has fixed widths for IE8 and below?
Many thanks,
Katie

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React Solution with Bootstrap 4.5.3
Worked before
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Perhaps your meta tag is missing the content attribute with values: width=device-width, initial-scale=1?
<meta name="viewport" content="width=device-width, initial-scale=1">
as far as i can recall chrome requires these attributes and values to work proper with custom media queries
EDIT
After a discussing with #user2381937 in chat and reading some external resources:
https://inspirnathan.com/posts/2-media-query-inspector-chrome/
https://www.sitepoint.com/rwd-scrollbars-is-chrome-better/
we found that chrome and firefox differ in how they consider the width of the scrollbar when rendering the page. And that the way forward is either to swap query breakpoints to account for the offset or to make browser specific queries.

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The gradient on the footer looks great in non IE browsers, but fails to show in IE 7,8 and the IE9 dev preview.
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This works:
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try opening the file in Photoshop or similar, and doing a clean save for web as a PNG.

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