Summary
/__worklist computes the full text diff of every file in each item and includes it in the response. When an item's files contains a large build artifact — e.g. a vendored app/vendor/xmlui-standalone.umd.js (~6 MB minified) plus its .map (~15 MB) — the resulting per-item diff is tens of megabytes, and the whole /__worklist payload is shipped to and parsed by the iframe on every worklist refetch. This is a severe, constant main-thread crush (typing/whisper/everything lags).
Evidence
With two items each carrying the vendored bundle, observed item diff sizes:
auto-scroll-chat-pane: 41,547,118 chars (~41.5 MB)iterate-xmlui-numeric-error: 9,859,837 chars (~9.8 MB)- total
/__worklist payload: ~51 MB
Removing the bundle/.map from the items' files dropped the same item diffs to 13.6 KB and 114 KB (total payload 139 KB) and immediately resolved the lag. The Inspector showed data:bind List "1 -> 279 items" in DiffView re-binding off the first 20 KB slice of the 41.5 MB string.
Fix
The diff machinery in /__worklist should cap or skip diffs for large/binary files:
- Skip text-diffing files above a size threshold (e.g. a few hundred KB) and/or detected as minified/binary; surface
"<path> changed (N bytes)" instead.
- This lets build artifacts remain in an item's
files (so the commit includes them) without ever shipping a multi-MB text diff to the iframe.
Workaround (in place)
The vendored bundle + .map were removed from the two items' files, eliminating the huge diffs. (Their commit is handled separately.)
Summary
/__worklistcomputes the full text diff of every file in each item and includes it in the response. When an item'sfilescontains a large build artifact — e.g. a vendoredapp/vendor/xmlui-standalone.umd.js(~6 MB minified) plus its.map(~15 MB) — the resulting per-item diff is tens of megabytes, and the whole/__worklistpayload is shipped to and parsed by the iframe on every worklist refetch. This is a severe, constant main-thread crush (typing/whisper/everything lags).Evidence
With two items each carrying the vendored bundle, observed item diff sizes:
auto-scroll-chat-pane: 41,547,118 chars (~41.5 MB)iterate-xmlui-numeric-error: 9,859,837 chars (~9.8 MB)/__worklistpayload: ~51 MBRemoving the bundle/
.mapfrom the items'filesdropped the same item diffs to 13.6 KB and 114 KB (total payload 139 KB) and immediately resolved the lag. The Inspector showeddata:bind List "1 -> 279 items"inDiffViewre-binding off the first 20 KB slice of the 41.5 MB string.Fix
The diff machinery in
/__worklistshould cap or skip diffs for large/binary files:"<path> changed (N bytes)"instead.files(so the commit includes them) without ever shipping a multi-MB text diff to the iframe.Workaround (in place)
The vendored bundle +
.mapwere removed from the two items'files, eliminating the huge diffs. (Their commit is handled separately.)