Horizon responds slowly in Chrome or Opera

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Issue

When using Horizon in Google Chrome browser (google-chrome-stable-51.0.2704.103-1.x86_64) or Opera(opera-stable_38) the VNC console respond time is very slow. Few seconds at times.

Environment

Red Hat Enterprise Linux OpenStack Platform 7.
Red Hat OpenStack Platform 8.
Red Hat OpenStack Platform 9.
google-chrome-stable-51.0.2704.103-1.x86_64
opera-stable_38.0.2220.29_amd64.rpm

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