Script Libraries from Google

Many of the script libraries that can be used with JavaScript suffer from the problem of being huge and taking a long time to download.

If you are going to use one of the more common script libraries then you can overcome the problem of it taking a long time for it to download by using a copy of the library that your visitor has already downloaded. The way to do that is for everyone to reference the library from a common repository rather than everyone using their own copy. Google make some of the most commonly used script libraries available from their site and if everyone using those libraries accesses that copy then many of your visitors will already have a copy of the library from other sites they have already visited.

Script Libraries from Google