I realize some of the ways are:Use the minified versions of all the .css and .jsLoad the common library elements (jQuery, etc.) from some common source. Not sure what the source that's most likely to already be in the browser cache is.Update:Here's an example. It's a bit slow to download (per Pingdom.com/tools)
How can I speed up the download time of a Bootstrap theme'd website?
performance
There's a thread on ideas to speed up a website on Pro Webmasters already so I won't cover aspects already covered since your question is primary focusing on bootstrap speed. A snippet of a good answer left by John Conde can be found below which will tell you what you should focus on speeding up a general website, and below that is my answer for speeding up Bootstrap.SOURCE: Answer from John CondeLeverage browser cachingSpecify image dimensionsAvoid CSS @importAvoid bad requestsCombine images into CSS spritesDefer parsing of JavaScriptEnable Keep-AliveEnable compressionInline Small CSSInline Small JavaScriptMake landing page redirects cacheableMinify CSSMinify HTMLMinify JavaScriptMinimize redirectsMinimize request sizeOptimize imagesOptimize the order of styles and scriptsPrefer asynchronous resourcesPut CSS in the document headRemove query strings from static resourcesServe resources from a consistent URLServe scaled imagesSpecify a Vary: Accept-Encoding headerSpecify a cache validatorSpecify a character setDefer loading of JavaScriptRemove unused CSSUse efficient CSS selectorsMy AdviceMy personal advice and recommendations when using any framework is to think what functions you absolutely need, Zurb Foundation and Bootstrap among many other frameworks have several customization options which will compile the functions that you need - meaning that you don't bloat your site with JavaScript that won't be used and CSS styling that just won't see any light of day.Bootstrap now offers way more than it ever did when it first launched and the default CSS is very large, so again if you want your bootstrap theme to be fast only compile the CSS and JS that you actually need and then follow the advice suggested by John Conde - You can compile your own version of Bootstrap here.