Hello, I like tasks like that and I'm pretty sure that can help you, loading for 6-7 seconds and 2.4 mb per page isn't good at all. I'm pretty sure that some js and css could be combined, some probably even removed and so on. I can try some server optimizations as well, but if you got well configured nginx installed they may not have an effect or have very small effect. Unfortunetely I can't guarantee that you will get all A marks in gtx metrics tests, but in common a lot of things will become better.
I'm open for chat right now. Feel free to ask your qustions.
Thanks, Alex