Shopify Messaging

I really like Shopify email and the fact that it is free and integrates easily. It is easy to use. My only two downfalls are (1) that I am limited in the amount of emails it allows me to send per week. I would like to send 3 emails per week to my subscribers, but I am unable to do so pending how I space them out. And (2) the email tends to take forever to load pictures, freezes up on me, etc. I have tried different browsers and experience the same results. I'm continuing to use it until I can find something a bit better to suit my needs.