[ubuntu] Website Slow Downs

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http://ubuntuforums.org – Hi! I have a Ubuntu server hosted website, and I've noticed lately that it randomly takes a while to load the site. It tends to do so after periods without use, and the initial load is what takes its time (Ive tested 24 seconds on first load). If I visit the site shortly after, i get load times of around 3-4 seconds. My thought is that it might be my hard drives spinning down and sleeping, and when a request comes in, the start back up and then send out the information requested, hence the long delay. My server is: IBMX360 with 4x Hyperthreading 1.6ghz Xeons (2 threads per core) 3GB (Hardware)