Comentário oficial
Please refer to the following topic:
https://support.dronesmadeeasy.com/hc/en-us/community/posts/115020337303-Save-a-mIssion-Toolbar
This is a CPU/GPU issue, not an internet connection speed issue.
When you have a data connection you are switching to the normal Apple Maps basemap and you are not operating from the saved tiles anymore. This is a fine workaround. The parallel display of the saved tiles has been adversely affected by the recently announced device slow downs to address battery issues: http://money.cnn.com/2017/12/21/technology/apple-slows-down-old-iphones/index.html
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