Find your current bottleneck. Go to static content wherever you can and get it replicated out and hosted somewhere. consider something like HAProxy (well.. ha

Find your current bottleneck. Go to static content wherever you can and get it replicated out and hosted somewhere. consider something like HAProxy (well.. haproxy!) in the stack out front to control concurrency to resources that are bottlenecked - that way you can at least get linear degradation instead of out of control degradation. EDIT: Drop the dynamic content wherever you can, shut off whatever dynamic parts you can and then scale out horizontally. Then fix the bottlenecks and bring them back online.