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On a slow link, a large image could never appear. Every image fetch was aborted 30s after it started, even while bytes were still arriving, and a failed fetch then sat on a 30s cooldown before it could be retried. At 240 kbps, anything over about 900 KB could not finish. On a shaped iPhone SE, a 1.45 MB avatar was fetched, aborted at 30s and never shown. - **Abort stalls, not slow downloads.** A fetch is now aborted when no headers or body bytes arrive for 20s, so a dead connection still frees up quickly. A download that keeps making progress can run for up to 5 minutes, so a server that trickles bytes cannot hold a connection forever. The 20 MiB response cap still bounds its size. - **Cancel previews scrolled past in the iOS carousel.** The carousel loads at most four previews at a time, and a preview scrolled past kept its slot until its download ended. With the longer limit, four slow previews could block the visible one for minutes. Now the carousel drops a cancelled preview's pending image-cache entry, and with no one left listening, the image loader aborts its HTTP request. Scrolling back starts a fresh download with no failure cooldown. A download that another consumer, such as the full-screen viewer or a gallery prefetch, is still listening to keeps going, and its finished image is still cached. Closing the carousel aborts its pending previews the same way. - **Cancel gallery prefetches that leave the window.** The message gallery prefetches a few pages around the current one with two workers. Each prefetch used to hold its download until it ended, which also kept the carousel's cancel from aborting it. Now a prefetch that leaves the window, or whose gallery goes away, lets go and aborts the same way. ### Validation Added tests (each fails without its fix): - A body that trickles in for longer than the stall timeout still loads, and one that never ends is aborted at the overall cap. - In the iOS carousel, previews scrolled past abort their stalled downloads (before headers and mid-body), the next preview loads, and scrolling back starts a new download. The test fails if the carousel doesn't evict, if the loader doesn't abort, or if the abort leaves a cooldown. - Closing the carousel aborts its stalled previews. - In a message gallery, jumping to the end and back aborts both in-flight prefetches and moves the workers to the new window. - Abandoning a load another consumer still waits for keeps the finished image cached with no second fetch; abandoning one nobody else waits for aborts it. - Rapid scrolling releases each cancelled carousel load at once, and cancelled loads never reach UIKit. The full mobile suite passes. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: Tom Brow <tomb@squareup.com> Co-authored-by: Tom Brow <tomb@squareup.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>