You can change your jpeg file size by up to x% or fixed width height, or change jpeg quality to reduce jpeg file size. This is an online web tool, no download, without Photoshop. Support batch mode. you can drag your jpg files into below “upload area” and click “convert” button...
And sure, as you can see the file size will get bigger (especially in this example), but overall the result is much better than a huge number of HTTP requests. Besides, from my testing and reading about other peoples’ results, if you gzip your CSS file the resulting size is about ...