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Reduce stalls when opening large diffs (#4574)

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* perf(app): reduce avoidable work when opening large diffs

Large snapshots were recursively reconstructed for reference stability, while native scroll worklets captured complete file models. Preserve identity at the data producers and prepare text for the visible window without rebuilding unchanged files.

* test(app): await commit diff query completion without polling

* chore(app): remove profiling artifacts from the source tree
This commit is contained in:
Mohamed Boudra
2026-09-09 16:05:44 +02:00
committed by GitHub
parent 0b3d82a469
commit d311797653
21 changed files with 816 additions and 163 deletions
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packages/app/src/git/diff-document/workspace-cache.tsx
+12 -5
View File
@@ -13,6 +13,7 @@ const MAX_MODEL_VARIANTS = 4;
const MAX_TYPOGRAPHY_RESOURCES = 4;
interface ModelVariant {
measureText: TextMeasurer;
key: string;
exactKey: string;
model: DiffDocumentModel;
@@ -38,23 +39,29 @@ export interface DiffDocumentWorkspaceCache {
}
export function createDiffDocumentWorkspaceCache(): DiffDocumentWorkspaceCache {
const variantsByFiles = new WeakMap<BuildDiffDocumentModelInput["files"], ModelVariant[]>();
let variants: ModelVariant[] = [];
const typographyResources = new Map<string, DiffTypographyResource>();
return {
buildModel(input) {
const key = modelVariantKey(input);
const exactKey = exactModelKey(input);
const variants = variantsByFiles.get(input.files) ?? [];
const variantIndex = variants.findIndex((candidate) => candidate.key === key);
const variantIndex = variants.findIndex(
(candidate) => candidate.key === key && candidate.measureText === input.measureText,
);
const variant = variantIndex === -1 ? undefined : variants[variantIndex];
if (variant?.exactKey === exactKey) {
if (
variant?.exactKey === exactKey &&
variant.model.files.length === input.files.length &&
variant.model.files.every((file, index) => file.file === input.files[index])
) {
variants.splice(variantIndex, 1);
variants.unshift(variant);
return variant.model;
}
const model = buildDiffDocumentModel({ ...input, reuseFrom: variant?.models });
const nextVariant = {
measureText: input.measureText,
key,
exactKey,
model,
@@ -62,7 +69,7 @@ export function createDiffDocumentWorkspaceCache(): DiffDocumentWorkspaceCache {
};
if (variantIndex !== -1) variants.splice(variantIndex, 1);
variants.unshift(nextVariant);
variantsByFiles.set(input.files, variants.slice(0, MAX_MODEL_VARIANTS));
variants = variants.slice(0, MAX_MODEL_VARIANTS);
return model;
},
typography(input) {