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Usually line noise. Fax machines check every page as it goes, and when the phone line is noisy they slow down and resend data, which stretches a quick fax into several minutes. Fine-resolution mode doubles the amount of data per page, so it slows things too. The machines are not stuck; they are being careful, and that caution costs time.
| Cause | What is happening | What helps |
|---|---|---|
| Line noise | Static on the line corrupts data, so the machines resend blocks until they arrive clean. | Plug the machine directly into the wall jack; try again later if the noise is from weather or construction. |
| Fine or superfine resolution | Each page carries roughly twice the data of a standard page. | Use standard resolution for plain text; reserve fine mode for handwriting and small print. |
| VoIP phone line | Internet calls compress and delay audio in ways fax timing was never designed for. | A VoIP adapter tuned for fax, or an online fax service that skips the phone line entirely. |
| Long-distance and international hops | More switches and conversions between the machines mean more retraining. | Send during off-peak hours; accept that overseas faxes take longer. |
| An old machine | Older modems top out at slower speeds and recover from errors more slowly. | Nothing to fix short of a newer machine or an online service. |
| Many pages | Ten pages take roughly ten times as long as one, plus overhead per page. | Split very large jobs or switch to email for bulk documents. |
Most modern machines use error correction mode, which chops each page into blocks and verifies every block. When a block arrives damaged, the receiving machine asks for it again. On a clean line this is invisible. On a noisy line the machines can spend more time retransmitting than transmitting, and they may also negotiate down to a slower speed mid-call to cope. That speed drop is deliberate: a slow, clean transfer beats a fast, corrupted one. If your fax crawls on one particular number but flies on others, the problem is that line, not your machine.
A slow fax that finishes is annoying, not broken. A fax that stalls on the same page every time, or fails after long minutes with a communication error, points to a real fault: a dying phone line, a failing modem, or a receiver whose memory is full. Try the same document to a different number. If it sails through, the destination is the problem. If it crawls everywhere, test your own line with a different phone cord and wall jack before assuming the machine is dying.
Every slowdown above comes from the analog phone line. Online fax services bypass it: your document travels over the internet to the provider, which hands it to the destination over a clean, managed connection. With LetterAgent you describe the fax to your AI assistant, approve the exact quoted total after the page count is verified, and pay once through Stripe. The fax service is currently in testing, and it supports US and Canadian numbers only.
Ready to fax it? Fax with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it is sent.
LetterAgent is a working name. Prices include print, postage, and our service fee. US prices in USD, Canadian prices in CAD (Canadian prices exclude applicable sales tax, added at checkout). Currently in private testing.
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