Serving your website over https:// is important for your safety and Google ranking. Let’s walk you through a free SSL certificate from StartSSL.
Wordpress can be slow. Sure. Depending on how you build a website dictates how fast a web site’s perceived performance or how short it’s critical path can be. Wordpress is not immune to this logic.
My current web hosting setup includes a multi-domain NGINX & PHP5-FPM VPS with 1CPU, 1GB RAM, and 20GB SSD from Digital Ocean serving WordPress sites.