I need to better understand optimisation option
I have two Wordpress sites with Inmotion, and I'm trying to speed them up,
Using the Cache Manager I have set up caching for both sites. One of them has NGINX Helper plugin installed, the other doesn't (I didn't realise until now that was the case). I have also tested out various optimisation plugins, including Autoptimise, Hummingbird, WP Optimise and Fastest Cache, singly or Autoptimise together with one other. None of them seemed to speed things up any more than when I just used the Inmotion caching, so I deactivated them all.
Yet my load speeds seem to have dropped recently. I have a very fast minimal theme, but Google Page Speed Insights says my slower loads are caused by "render-blocking resources". It advises me to " inline critical assets and defer less important resources". So my questions to you are these please:
1. Do I need both the Inmotion cache and the NGINX Helper plugin to increase load speed?
2. If I have both of these, do I need another optimisation plugin as well? Which would you recommend for my situation?
3. Does caching (either Inmotion's cache or caching plugins) address the issues raised by Google Page Speed Insights? Does the Autoptimise plugin or any other plugin address those issues?
4. Do you know of any reason why my testing didn't show any speed advantage with any of the plugins? Do I need to wait for a few days/weeks to get the advantage of them, or should they help straightaway?
Thanks for any advice you can offer.