Would it be a good move to set up Apache for Wordpress with SSL with such a setup:
http/2 php 7.0 fast-cgi APCu memcached
memcached is for Wordpress Batcache plugin
As I understand php 7.0 should speed things up compared to php 5.6 and http/2 should boost the SSL.
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php 7 will load up your WordPress site a good bit. However updating to php 7 with an existing php 5.6 install could get hairy. I would suggest deploying new droplet and install php7, apache, etc first then migrating your site over to new droplet and then turn down the old droplet.