I haven’t use the google pagespeed insights tool but we use pingdom for our testing and results are impressive for the agile theme –
https://tools.pingdom.com/#!/GeyK1/https://www.livemeshthemes.com/agile
You can do a few things to improve performance –
1) Enable WP Super Cache to enable compression and increase response time.
2) You can use https://wordpress.org/plugins/bwp-minify/ to minify CSS and JS. If you run into rendering issues, pls disable the plugin and let me know about it.
3) The revolution slider is responsible for some of the poor scores and slow down performance as well. Try moving to a lightweight slider like Metaslider plugin and see if things look better.
4) You can consider moving to a different host as well. I see that there is a big initial server wait of about 1.8 seconds and not sure why that’s happening.
Hope this helps.