I have just installed W3 total cache onto a website, not just for speed, but also to cope with large spikes of traffic that I get a few times per year based around certain events.
When this happens, I'll get 10-20k visitors, almost entirely on just a single post or two of the site. These posts are constantly updated, making a live blog of event coverage, and people are reloading that all throughout the time. Therefore, simply caching the page wouldn't work, since the folks wouldn't see the updates. What's the best way to improve performance for a site considering this?