Optimizing DICOM viewer performance (Review Mode)
Consider the following points should image viewing feel slightly delayed.
Inside the DICOM viewer (Review Mode)
- Ensure only one DICOM viewer browser tab is used.
Having multiple viewer tabs open may result in an error and is not supported. - Ensure the study series contains more than one image and is not a secondary capture.
Preload the series or Preload the full study.

- Preloading will download the images temporarily to your computer browser memory. The images are automatically deleted when the viewer tab is closed.
- Preloading can take seconds or up to a minute depending on your network speed, study size, and computer hardware specifications.
- To preload, click the cloud symbol next to the series or full study you want to load.
DICOM images contain a lot of additional data and a study file size and preload time can vary considerably. If preloading many big cases frequently consider quitting your web browser periodically to free up resources.
Internet speed and other programs
- Ensure an internet connection of at least 70 Mbps.
Click here to test your internet speed -
- For best performance use Google Chrome web browser.
- Close all other open programs to maximize computer resources.
- Consider testing speed performance also using 4G or 5G networks.
Accessing CMRAD cases from within a hospital network or via a VPN?
- Accessing a VPN or via a hospital network may affect performance.
Service quality and security configurations set by an institution for its available network infrastructure may impact performance and internet speed. Consider switching to a personal computer and using a personal internet connection if performance is delayed in this scenario.
Contact support@cmrad.com for any further questions and support.
Please include the case URL or link, the web browser used and please note your access location when emailing.