[RCU] Speed-ups for a slow computer?
emailgrant at gmail.com
Fri Aug 2 08:04:13 CEST 2013
>>>>> Can anything be done to speed up Roundcube on a Celeron 700 with 512MB
>>>>> RAM (maxed out) running Gentoo Linux? We're using the Chrome browser
>>>>> and the CPU is 95% idle when no one is logged into X. I'm getting
>>>>> reports of 30+ seconds to open an email.
>>>> Your problem is likely the amount of RAM; when you start X and Chrome,
>>>> your client almost surely starts swapping, because there isn't enough
>>>> RAM for the running processes. Roundcubemail uses AJAX which requires a
>>>> processes (including Chrome) are swapping.
>>>> On such low-end systems you should use a very lightweight browser
>>>> instead of Chrome, even if this can give some limitations.
>>> This is simple to check. With all apps running simply run "free -m" and
>>> post the output here.
>> Here's what I get while someone is seated at the system and using
>> Roundcube in Chrome:
>> # free
> Using the "-m" switch displays output in megabytes--easier to read.
>> total used free shared buffers cached
>> Mem: 513072 447812 65260 0 16896 209672
>> -/+ buffers/cache: 221244 291828
>> Swap: 2097148 0 2097148
> This clearly shows the host isn't using swap, has 64MB free, and is
> using ~200MB for buffer cache. So it seems to have plenty of memory.
> JVMs and JAVA are notoriously inefficient, but that should cause a 30s
> delay just opening a new email. Using HTTPS and JAVA together may be
> enough to bring a Celery 700 to its knees. Try using straight HTTP
> instead to eliminate the encryption. This will make a big difference
> with binary attachments such as photos and the like. With small text
> only emails it shouldn't cause a big delay.
I'd rather stick with HTTPS if possible. Are there any other good
options for speeding things up besides switching browsers and
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