I have read many info about optimizing websites (varnish, caching...) All these look quite complex.
I wonder if cloud hosting can help me. Are there automatic scaling solutions ? Simplicity is the keyword for me.
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scaling is not simple. It's why certain people that are very good at building a system that scales and others that are good at designing the code to scale get paid a lot of money for their work. Cloud is not the end all solution to scale.