Skip to content

⚡ Optimize heatmap date parsing performance #84

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
is0692vs merged 2 commits into from
Mar 21, 2026
Merged

⚡ Optimize heatmap date parsing performance #84

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
c08e361
perf: optimize heatmap date parsing by caching day and directly extra…
google-labs-jules[bot] Mar 20, 2026
164f22b
perf: optimize heatmap date parsing by caching day and directly extra…
google-labs-jules[bot] Mar 20, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
16 changes: 13 additions & 3 deletions src/lib/github.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -662,11 +662,21 @@ export async function fetchActivity(
);

const eventCountMap = new Map<string, number>();
const dayCache = new Map<string, number>();

for (const event of allEvents) {
const date = new Date(event.created_at);
const day = date.getUTCDay(); // 0=Sun, 6=Sat
const hour = date.getUTCHours();
const createdAt = event.created_at;
const datePart = createdAt.slice(0, 10);

let day = dayCache.get(datePart);
if (day === undefined) {
day = new Date(datePart).getUTCDay(); // 0=Sun, 6=Sat
dayCache.set(datePart, day);
}

// Fast hour extraction from YYYY-MM-DDTHH:MM:SSZ
const charCodeZero = '0'.charCodeAt(0);
const hour = (createdAt.charCodeAt(11) - charCodeZero) * 10 + (createdAt.charCodeAt(12) - charCodeZero);
heatmap[day][hour]++;

eventCountMap.set(event.type, (eventCountMap.get(event.type) ?? 0) + 1);
Expand Down
Loading