Offer Litespeed Webserver besides Nginx
Litespeed offers a nice performance increment over Apache and Nginx. This would be a great addition to your current performance-oriented offer.
http://www.litespeedtech.com/products/litespeed-web-server/benchmarks/small-static-file
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votes

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Wu YongJin commented
Please consider OpenLiteSpeed as well!
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Ben commented
This would be fantastic as we already used Litespeed and they have a great Wordpress plugin that makes implementing it on WP sites trivial