Meanwhile I could find, why community.freepbx.org is awful slow for me and many others probably, too: There are problems with the host community.freepbx.org if the MTU is smaller than 1500 Bytes (if you are using DSL with pppoe e.g.).
Problem is, community.freepbx.org (18.104.22.168) ignores the MSS TCP option and always uses the MTU 1500. I’m currently using a VPN (OpenVPN) as workaround, with additional use of fragment option. This option turned on forcefully fragments each packet > 1500 Bytes - if the server ignores MSS.
Could you please fix the problem?
BTW: fpbxforums-sangomaus.netdna-ssl.com (22.214.171.124) doesn’t show the problem.
How to test?
You can test it with wget https://community.freepbx.org and parallel tcp trace (tcpdump). You can see the MSS problem, if you are seeing TCP Retransmissions or if the throughput is just a few KB/s (<70 KB/s - > 200 MB/s if it works as it should).