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I tried this:

  1. used your chart-performance example as a starting point
  2. added second series
  3. tried to add in a shared tooltip

The result of trying to make this work is in this stackblitz:

I faced this issue:
after generating the data i hover over the chart area and suddenly the console starts flooding with errors:

I tried a lot of things to try and make it work but i didn't manage. 

There is another issue that gets visible the more datapoints you add to the series:
The second series is drawn weirdly: It is cut off diagonally showing only the top/right half of the values for the second series. 
This gets more visible with higher numbers of datapoints.
I would put the second thing in another ticket but i have a suspicion that both might be related.