Ok I’ve just tried this plugin out. Doesn’t seem to help much. WordPress first load actually took 8 seconds after turning the plugin on. Then afterwards it might have saved 20 ms off of 380 ms load times if that.
WordPress just seems to be a chunky slow loading/running php application. You think you could get the load times to under 100 ms but nope… 400 ms is the best you can do on vanilla WP?!