Speed Up Gmail on iOS

I notice a frustrating delay every time I open or read an email that comes through my Gmail account in the Apple Mail app on my iPhone and iPad. Other apps feel snappy, so I’m convinced the issue is tied to the way Gmail syncs with Apple Mail rather than my network connection... (Budget: $15 - $25 USD, Jobs: IMAP, iOS, iPhone, Mobile App Development, Technical Support, Troubleshooting)