HUGE lag when receiving and sending emails – Spark Mail + AI: Email Inbox Review

I want to love this app and service, I really do. But the lag makes it absolutely unusable. I love the sleep features and ability to mark all is read, but my email page takes forever to load, and will not update with new emails— even when I have already gotten the notification or can see it on Gmail. If this issue was fixed, I will become a very avid user, but until then this app is unusable.
Review by Bellatg101 on Spark Mail + AI: Email Inbox.