Why does CiraSync take so long to sync my contacts and calendars?

CiraSync Knowledge Base

Updated on Jan 18, 2026 Tags: Calendar Sync Contact Sync Support Articles

There are multiple factors that can affect CiraSync performance. These include the following:

  • Number of mailbox in a tenant
  • Amount of updates that need to be made
  • Type of data that needs to be written in
  • Current performance of Exchange Web Services (EWS)

Below are steps you can take to speed up CiraSync sync tasks:

  1. Set up your CiraSync tenant to use multiple service accounts.
  2. Enable the CiraSync streamer in the Schedule pane of the CiraSync dashboard if the sync source is a shared mailbox or a Public Folder. CiraSync will then periodically read the source and then sync any changes found to user mailboxes. 
    NOTE: Unfortunately, CiraSync has no control over the performance of EWS, and no workaround exists to improve its performance.

If you want more scheduled updates to occur, check out this article on The CiraSync Streamer and How to See Contact Sync Result Reports.

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Ema Zulic

Ema Zulic is the Vice President of Product Management and Customer Support at Cira Apps Ltd, where she drives product strategy, customer experience, and global support operations. With over 10 years of SaaS support expertise and more than 20 years of overall customer support leadership, Ema is blending deep technical insight with a passion for building high‑performing, customer‑centric teams. Her work focuses on delivering intuitive products, refining support processes, and creating seamless experiences for enterprise organizations. Outside of her leadership role, Ema shares practical, real‑world guidance to help companies strengthen their support models, improve operational efficiency, and elevate the customer journey.

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