 <p>Its highly unlikely that you really want to be decompressing assets on every IE request. Imagine firing up a JS runtime for <em>every</em> request just to compile less. Instead, consider storing a second copy of the assets that are uncompressed and can be served statically.</p> <p>You may want to determine what about compiling your assets causes a problem with IE. It may be a bug in the compression software or you may need to change settings or to a different minifier. Or better yet, it could be an indication that you have a syntax error in your CSS that other browsers are forgiving you for when compressed, and IE is not.</p>