Proton vs Fastmail for Dev Teams 2026
#3b82f6; font-size: 0.75em;”> our benchmark ↓ 4.2s Proton IMAP sync (100 emails, Bridge) our benchmark ↓ 1.1s Fastmail IMAP sync (100 emails, native) our benchmark ↓ Fastmail’s performance edge stems from architecture: no real-time client-side decryption overhead on delivery. Proton decrypts cont…