Disabling animation of the Wifi connection icon
You cannot just tweak the arrows from the UI. But you can disable the notification icon.

Since you’re on Marshmallow, first enable System UI Tuner by long pressing the Settings icon in the pull-down notification shade for 5 seconds. Then go to 

Settings-&gt;System UI Tuner-&gt;Status bar-&gt;Disable WiFi. 

Done.