I have a high traffic website and I need make sure my site is fast enough to display my pages to everyone rapidly.

I searched on Google many articles about speed and optimization and here's what I found:

• Cache the page
• Save it to the disk

Caching the page in memory:

This is very fast but if I need to change the content of my page I have to remove it from cache and then re-save the file on the disk.

Save it to disk

This is very easy to maintain but every time the page is accessed I have to read on the disk.

Which method should I go with?

Thanks