Do I really need a cdn?

Hello who know can you please answer. I'm searching for a CDN service to use with my wordpress blog to improve blog’s google pagespeed score and serve web pages faster to visitors, etc. I found this one http://cdnsun.com and want try free trial. Is it the truth that CDN helps to load the content faster in blogs by taking care of static files in a website? Do I still need a CDN with vps?

Thanks in advance.
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Theoretically, yes a CDN should improve website performance. In practice, it depends a lot on your website. How many daily visitors does your website have? What are the demographics of your visitors? What is your bounce rate? What does your current server load spike at? 95th percentile?

If you can't answer these questions, then you don't know if you need a CDN. My strong guess is "no".
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