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You will find lots of online tool for this and also you can check it through the source code.

There are not any specific technique for internet marketing. You have to apply multiple techniques like social media, content marketing, etc.

Now i think you got all the necessary points about your site speed.

Both work done by crawler and when crawler come first time in your site its also index your page in SERP and after it return your page again and again for giving the weightage for your site.

Nice information about SaaS and its a benificial product.

Outsourcing is a nice way to develop your project and also its a cost effective process.