Slow myopenhab.org

since yesterday https://myopenhab.org is very slow and taking a longtime on android and ios apps for remote connections. The sitemap eventually loads up after a minute or so

local connection over the same network is working lightening fast.

Can anyone please provide some ideas how to troubleshoot ?
Some environment details:
$cat /etc/centos-release
CentOS Linux release 7.5.1804 (Core)

$ssh openhab@localhost -p 8101
__ _____ ____
____ ____ ___ ____ / / / / | / __ )
/ __ / __ / _ / __ / // / /| | / __ |
/ /
/ / // / __/ / / / __ / ___ |/ // /
_/ ./_// /// /// |/_____/
/_/ 2.3.0
Release Build

Hit ‘’ for a list of available commands
and ‘[cmd] --help’ for help on a specific command.
Hit ‘’ or type ‘system:shutdown’ or ‘logout’ to shutdown openHAB.

openhab>

$ tail /var/log/openhab2/openhab.log
at io.socket.engineio.client.transports.PollingXHR$Request$1.run(PollingXHR.java:218) ~[?:?]
… 1 more
2018-10-19 03:10:34.760 [INFO ] [io.openhabcloud.internal.CloudClient] - Disconnected from the openHAB Cloud service (UUID = 54f60038-408c-4a88-84f9-05624bd62517, base URL = http://localhost:8080)
2018-10-19 03:10:38.216 [INFO ] [io.openhabcloud.internal.CloudClient] - Connected to the openHAB Cloud service (UUID = 54f60038-408c-4a88-84f9-05624bd62517, base URL = http://localhost:8080)
2018-10-19 03:15:05.527 [WARN ] [okhttp3.OkHttpClient ] - A connection to https://myopenhab.org/ was leaked. Did you forget to close a response body?
2018-10-19 07:57:57.539 [WARN ] [io.openhabcloud.internal.CloudClient] - Jetty request 2739401 failed: null
2018-10-19 17:02:25.652 [ERROR] [org.openhab.io.net.http.HttpUtil ] - Fatal transport error: java.net.UnknownHostException: api.ecobee.com
2018-10-19 17:02:25.652 [WARN ] [inding.ecobee.internal.EcobeeBinding] - Exception reading from Ecobee: Could not get thermostat summary.
2018-10-19 18:08:49.562 [ERROR] [org.openhab.io.net.http.HttpUtil ] - Fatal transport error: java.net.UnknownHostException: api.ecobee.com
2018-10-19 18:08:49.563 [WARN ] [inding.ecobee.internal.EcobeeBinding] - Exception reading from Ecobee: Could not get thermostat summary.

yes indeed, these past few days it has sometimes been extremely slow. Then it just “wakes up”, then becomes awfully slow again.

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