The below

The below is the error text given me by my host as the rational behind extremely slow site load. It makes sense to me if a specific IP or host name cannot be resolved there would be a timeout. That coupled with network latency is causing prohibitive delays for the web site.

The site is live. Plugins may not be disabled. I have enabled WPMUDev Support Access. Can you help me?

[28-Mar-2017 11:44:53 UTC] PHP Warning: preg_match_all(): Empty regular expression in /home/uccbozem/public_html/wp-content/plugins/wp-defender/app/module/scan-module/component/class-wd-suspicious-scan.php on line 506
[28-Mar-2017 20:37:35 UTC] [WPMUDEV API Error] 4.3 | cURL error 6: name lookup timed out ((unknown URL) [500])