I have a single scripts.js file that houses all my main javascript. At the top of the file I've copy & pasted several jQuery plugins that I frequently use. I've merged everything into one file to achieve download efficiency by preventing multiple header calls.

Is it bad to include all plugins in the script file the way I'm doing? I don't know the innards of how jQuery works, but do these plugins all have to somehow "register" with jQuery, which can cause a user's browser to bog down while it does this?

Is it better to just load the plugins as individual, external files on demand using something such as Modernizr.load()?

Most of the plugins I'm using are pretty lightweight, but a few are quite bulky (FlexSlider).