vBSEO + vBulletin :: Caching / Accelerator :: How are you set up?

I thought I would make a thread to see how some of the larger boards have their servers set up.

I was hoping to gain some feedback to these questions:-

1. What Caching Solution do you use?
2. Are using a php accelerator?
3. Are you using anything else to speed up performance?

I am trying to see what the best and most reliable set up is for those people running vbseo and vbulletin - our site is running very very slow -we have no cache and no accelerator installed but think it's prolly about time we looked at this.

Thanks for participating

I am using xcache as php accelerator and memcached as datastore caching. However i didn't enable any caching option from vbseo. I also use lighttpd instead of apache .

I'm curious why vbseo caching option is not enabled?

Does anyone have this enabled? If so, whats your setup?

well..
on vb3.6.8
using Xcache + datastore using xcache

Dual Xenon 2.4 GHZ
3GB Ram
73GB 10k RPM Raid 1

Two Dual Xenon Memcached servers

Using Apache 2.2.6/PHP 5.2.5/MySQL 5.0.45/Xcache 1.2.1/Memcached 1.2.2

VBSEO cache and vBulletin datastore is stored in memcached. I also store my wordpress cache in memcached. I use around 400kb in memcached.

is there an alternative to memcached?

I have one server, not two - doesnt memcached require a shit load of memory and at least two servers?

It only requires as much memory as you want to give it. I only set it to allocate 4MB to memcached.

It's preferred to have memcached on a machine that isn't your webserver or database server yea.