Roundcube webmail slow loading

[patton]

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

[SKaero]

The most likely source of the delay is the the mail server. If you have access to the root of the server you could enable imap_debug in the Roundcube config and see what commands are being sent to the mail server and the time its taking to respond.