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Generally, since DigitalOcean uses SSD’s, a swap file isn’t recommended. Since swap uses disk to make up for the lack of RAM, once you begin hitting swap, CPU % is going to skyrocket as the load comes from the increased disk utilization.
The increased CPU % will often be a combination of heavy swap usage as well as higher wait time as a result – this means the CPU load is high enough to where it’s having to wait on other processes to finish up before another can be put through.
In such a case, you may actually need to upgrade your Droplet so that you have more CPU and RAM available to cope with said load.