How to load magento page under 3 sec?

Recently I am facing high loading speed in my Magento store. I have also made the priority js code for content in the web page. so Refrain JS from loading upfront. and also I have compressed many files including CSS minification, gzip compression etc. all my images are well optimized since then my website load speed is high. I have also come across from one of consultant ecommerce agency in usa regarding my issue, they asked for migration to Magento 2 . is it possible to reduce load time with Magento 1 or I need to migrate to Magento 2?
mark RichardAsked:
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It is not possible without code optimization and Full page caching
Kostyantyn Bibike-Commerce Project ManagerCommented:
Hello, Mark!
There are a lot of things to pay attention to, maybe you will find some tips regarding speed optimization here as well (it is actual for Magento 1 too).
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