Page Speed
Speed depends upon many things like your server speed, items being loaded on page, images and third party scripts. To increase page speed you can use any cache plugins
https://wordpress.org/plugins/wp-fastest-cache/
OR
https://wordpress.org/plugins/w3-total-cache/
And also optimize your images.
https://wordpress.org/plugins/wp-smushit/
If you go for the paid plugins then we will suggest you to use below plugins
WP Rocket : https://wp-rocket.me/
Nitro Pack : https://wordpress.org/plugins/nitropack/