How to tell when you need to upgrade droplet to larger size?

My wordpress and lamp site is getting 50 users within a 15-minute interval at peak times.

CPU usage spikes at 2.5% and it still seams pretty quick.

How do I tell if I need to resize the droplet? And if I need more ram or another CPU?



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It’s easy to upgrade/downgrade memory and CPU so you can always test the performance with more cores/memory and downgrade to the original set’up if it’s the same.