Skip to main content
Was this helpful?

Performance Issues

PrimeCal feels slower than expected — pages take a long time to load, calendar views are sluggish, or events are slow to appear. Here are the most common causes and easy fixes.

Calendar views are slow to load​

Most likely cause: You have a large number of calendars all visible at once, and PrimeCal is fetching and rendering events from all of them simultaneously.

Fix:

  1. In the sidebar, uncheck calendars you don't need to see right now — fewer visible calendars means fewer events to load.
  2. Switch from Month view to Week or Day view — Month view shows the most events at once and is the most demanding to render.
  3. If you have many automation rules, disable rules you are not actively using (Dashboard → Automation).
  4. If you have several external calendars synced, try temporarily disabling sync for calendars you rarely look at (Settings → Calendar Sync).

Memory usage grows during a long browser session​

If you leave PrimeCal open in a browser tab for many hours or days, the tab may become slower over time.

Fix:

  1. Reload the page. This resets the browser's memory for the tab and is always safe to do.
  2. Avoid leaving the calendar open in a background tab for very long periods — a daily reload keeps things running smoothly.

Everything is slow today but usually fine​

Occasional slowness can be caused by a temporary load spike on the service or a slow network connection.

Fix:

  1. Check your internet connection — try opening a different website to see if it's your network.
  2. Wait a few minutes and reload. Service load spikes are usually brief.
  3. Try a hard refresh: Ctrl+Shift+R (Windows/Linux) or Cmd+Shift+R (Mac).

Events take a long time to appear after creating or editing them​

Most likely cause: The event was saved but the calendar view hasn't fetched the latest data yet.

Fix:

  1. Reload the page — the view will re-fetch all events.
  2. If you're using external calendar sync (Google or Microsoft), allow a minute or two for the sync to propagate.

Still stuck?​

If performance problems are consistent and reloading doesn't help, contact support with:

  • Which view or feature is slow (Month view, event list, automation panel, etc.)
  • Roughly how many calendars you have enabled
  • Your browser and device (e.g., Chrome on a 2021 MacBook Pro)
  • Whether the slowness started recently or has always been present