There are many better written guides available online than the ones that were here so I have decided to distil all the important bits into the points below:
This will help make your programs faster and more reliable. If you are using a scripting language, replacing it with Java or C# will in the long run save you time and money.
Use modern image formats such as WebP where possible. Reduce the amount of JavaScript used and compress any scripts with Google's Closure Compiler or similar. This will improve the visitor experience and save on costs.
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