Error - File is over 15mb, this might cause reduced performance.

Problem reported by Chew Man Fai - 8/18/2025 at 8:30 PM

Submitted

Hi,

We are experiencing slowness when accessing webmail. There is no issue observed from the server side, as it appears to be running smoothly. However, from the SmarterMail logs, we found the following errors:

[2025.08.19] 00:04:23.183 [FileFunctions] File is over 15mb, this might cause reduced performance. Size: 16.5mb Filepath: F:\SmarterMail\Domains\se***\Users\ray\folder-80003.json

[2025.08.19] 00:05:28.201 [FileFunctions] File is over 15mb, this might cause reduced performance. Size: 37.2mb Filepath: F:\SmarterMail\Domains\mit***\Users\mm\folder-720003.json

[2025.08.19] 00:05:32.389 [FileFunctions] File is over 15mb, this might cause reduced performance. Size: 25.8mb Filepath: F:\SmarterMail\Domains\mit***\Users\ro\folder-870003.json

[2025.08.19] 00:05:35.826 [FileFunctions] File is over 15mb, this might cause reduced performance. Size: 32.9mb Filepath: F:\SmarterMail\Domains\mit***\Users\to\folder-970003.json

[2025.08.19] 00:05:39.733 [FileFunctions] File is over 15mb, this might cause reduced performance. Size: 33.3mb Filepath: F:\SmarterMail\Domains\mit***\Users\wan\folder-980003.json

[2025.08.19] 00:05:46.592 [FileFunctions] File is over 15mb, this might cause reduced performance. Size: 20.2mb Filepath: F:\SmarterMail\Domains\mit***\Users\yutaka\folder-7830003.json

Could this be the root cause? Previously, we tried renaming the affected .json files, and performance improved temporarily, but the file sizes eventually exceeded 15MB again.

Do you have any suggestions to resolve this issue permanently? Would upgrading to the latest version help address this problem?

Thank you.

2 Replies

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Derek Curtis Replied

8/19/2025 at 7:23 AM

Employee Post

If the users with those folders are the ones experiencing issues, then yes, that may be the issue. Did this just start occurring? Did you recently upgrade the server?

Looking at your account, you have a number of different licenses across various versions. Just want to try to narrow down which version is seeing the issues.

As an aside, renaming JSON files is not generally recommended as it can lead to other issues.

Derek Curtis COO SmarterTools Inc. www.smartertools.com

Chew Man Fai Replied

8/20/2025 at 5:58 PM

Hi Derek,

This issue is occurring under version Build 8587. We have not upgraded the server yet.

Yes, we are using different licenses across various versions, and the usage for each license can be considered the same. So far, this is the only instance experiencing the issue.

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