Web checks are currently executed on the Zabbix server. This should be done from Zabbix Agent instead, for a number of reasons:

1. Running many checks on the server does not scale well.
2. Running a performance-test on the server measures not just the performance of the web site but more dominantly just the internet connection between Zabbix Server and the web server. Zabbix Agent can more reliably check just how fast the web server actually responds, regardless of network issues.
3. During an outage of either the Zabbix Server or some part of the network in between Zabbix Server and web server, no measures are being taken. If done on the Zabbix Agent, especially when also using a Proxy, measurements would continue uninterrupted.