Roundcube webmail slow loading

optimusproweb

• June 08, 2026 12:21
• Edited

Dear all,

I am experiencing a severe performance issue with Roundcube webmail v1.6.16 on a specific cPanel account. When users log in, the inbox folder (and occasionally other folders) takes anywhere from 2 to 4 minutes to load.

The cPanel account has plenty of room to breathe, so I don't believe it's a standard resource starvation issue. Here are the CloudLinux LVE limits and current usage details for this account:

• CPU: 2 Cores

• RAM: 4 GB

• Entry Processes (EP): 70

• Number of Processes (NPROC): 200

• I/O Usage: 20 Mb/s

• IOPS: 2024

• Disk Space: 150 GB allocated (currently at ~50% usage)

• Email Account Limits: All accounts are set to Unlimited storage.

Any help or direction on which logs to tail would be greatly appreciated!

Best regards

• 

  cPRex Jurassic Moderator

  • June 08, 2026 13:41

  Hey there!  It's interesting that this is happening on just one account.

  You mention there is about 75G of usage on the account - is most of that email?  If so, it could take a minute, but I wouldn't expect it to be "minutes."

  Do you see anything helpful inside the Roundcube log itself? https://support.cpanel.net/hc/en-us/articles/360054983694-Where-can-I-find-the-Roundcube-error-log

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• 

  optimusproweb

  • June 08, 2026 16:10

  Hello cPRex,

  Thanks for your answer. 

  Just to clarify on the storage: the 75GB is the total usage for the entire cPanel account. The specific email address that is experiencing the issue is only using 9.84GB, so I wouldn't expect it to be lagging this heavily based on its size alone.

  I also checked the Roundcube error log like you suggested, but I didn't see anything out of the ordinary or anything that points to this specific problem.

  What would you recommend to look at next?

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  cPRex Jurassic Moderator

  • June 08, 2026 16:11

  Honestly I'm not sure - this is likely an issue that would best be handled in a ticket.  

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