Hi John,
Thank you for your reply. Sorry for not providing more info. What I was aiming to say is that I used PageSpeed Insight and the critical level of speed is only for mobile version. Desktop version is at 89%, but mobile one is 29% and it used to be 44 or 43. As majority of my website traffic is on mobile it’s extremely important for me to increase it asap. I’ll take dive in in those links you provided.
Is there a plugin that could help with this?