Overview of Problem
Slow preview loading in Box can manifest as a generic icon or a spinning circle. This issue is caused by slow download speeds to dl.boxcloud.com, which can be due to environmental factors (e.g., international location) or network issues (e.g., firewall/proxy interference). It can also occur if the file is very large or complex, taking longer to load.
Process for Resolution
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Check Network Issues:
- Verify if there are any network settings affecting dl.boxcloud.com.
- Use a tool like Ookla or a similar service to test the download speed.
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Obtain a HAR File:
- Open the browser’s developer tools (usually F12 or right-click and select “Inspect”).
- Go to the “Network” tab.
- Reproduce the issue and export the HAR file.
- Browser-specific instructions in How to Generate Network Captures for Troubleshooting.
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Reduce File Size:
- If the file is very large or complex, use a tool like smallpdf.com to reduce its size.
Outcome
- With network issues resolved or file sizes reduced, previews should load faster.
Alternatives
- If network issues persist, contact your network administrator to check for firewall/proxy interference.
- If the file is too large, consider splitting it into smaller parts or using a different format.
- If you continue to experience any of the symptoms listed above, open a support ticket at support.box.com for further assistance.