Swift Performance provides awesome API features, like: Critical CSS, Minify scripts with API, Remote Cron, Remote Prebuild, Image Optimizer and automatic updates.

If API connection is ok, you will see it on Swift Performance Dashboard. If there is an API connection issue, you will also find an error message on dashboard, in that case you need to debug it.

Most common issue, is that the purchase key is not set. First you need to activate your license

Also it can happen that your firewall is blocking outgoing connections. In that case you need whitelist Swift Performance API URLs:


It can also happen that your server’s IP has been blocked by our firewall. In that case, please click to Debug next to API connection: FAIL. Then please open a support ticket and send the response, to see the outgoing IP address of your server.