How to speed up my site?

My site is slow. Disabling Site Preloader in theme didn't help, there's cache installed also. How can I speed it up?

    Adam Czajczyk

    Hello Christian!

    I would like to take a closer look at your site and examine it. For this, I'd need to access your site directly. Please send in:

    Subject: "Attn: Adam Czajczyk"

    - Mark to my attention, the subject line should contain only: ATTN: Adam Czajczyk
    - Do not include anything else in the subject line, doing so may delay our response due to how email filtering works.
    - Link back to this thread
    - login URL and admin account login credentials (may be a temporary admin account) data
    - Include FTP log-in details (hostname, username & password)
    - Include hosting control panel access details (login address, username & password) - cPanel's usually the control panel used for this, but your provider may use something else; I'll need this for accessing your site's database, preferably via phpMyAdmin
    - Include any relevant URLs for your site

    Please use our contact form here https://premium.wpmudev.org/contact/#i-have-a-different-question

    Best regards,
    Adam