When zooming on Graphs, too many requests are being made causing slowness

[cigamit]

Describe the bug
If you have 50 graphs on the page, and then zoom, you will notice that 101 network requests are made. There should be only 50. This causes a slowdown in the user interface.

To Reproduce
Steps to reproduce the behavior:

1. Open the browser debug panel and goto the network tab
2. Go to any Graph page
3. Initialize a zoom.
4. Note that there are several duplicate requests

Expected behavior
There should be only one request per graph