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by londons_explore 2475 days ago
Inline base64 shouldn't have any head of line blocking or slow rendering issues, unlike embedded images-as-mime-attachments, which will normally result in one HTTP request to gmails servers per image, and without QUIC you'll get head of line blocking and limited/no HTTP pipelining making that very slow.

Inline base64 should perform fine for small images up to ~10k images I'd guess on most hardware.

If your email contains more than 10k math equations, perhaps email isn't the right tool...