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I want to change the CMS

Recently I created a website. I am working on this website through WordPress. Now the issue is speed of my website is too much slow. One of my friends suggest me to change the CMS from WP to netlify. I just wanna ask is it possible? If yes, Can I do it by myself or I need to hire a Developer for this purpose?
If you have any solution so please guide me about it.
Thank You

Welcome to the forums @michaljhon1

You will find many answers to this question if you search WordPress in these very forums. You might also find this a good read.